lookfor could not find polyfit using keyword 'polynomial' and 'fitting'.

I thought the function lookfor searches for the keyword given in the first line (referred as 'summary line' in the reference page) of all the reference pages. However, lookfor fitting and lookfor polynomial does not show polyfit.

>> lookfor polynomial
conv                           - Convolution and polynomial multiplication
deconv                         - Least-squares deconvolution and polynomial division
polyeig                        - Polynomial eigenvalue problem
Find and Remove Trends         - Find and remove polynomial or periodic trends from data in the Live Editor
Polynomial                     - Perform evaluation of polynomial coefficients on input values
polyBasis                      - Polynomial basis functions for tunable gain surface
images.geotrans.PolynomialTransformation2D - 2-D polynomial geometric transformation
ac2poly                        - Convert autocorrelation sequence to prediction polynomial
poly2ac                        - Convert prediction filter polynomial to autocorrelation sequence
poly2rc                        - Convert prediction filter polynomial to reflection coefficients
polyscale                      - Scale roots of polynomial
polystab                       - Stabilize polynomial
rc2poly                        - Convert reflection coefficients to prediction filter polynomial
polyconf                       - Polynomial confidence intervals
polytool                       - Interactive polynomial fitting
bernstein                      - Bernstein polynomials
gcd                            - GCD of numbers and polynomials
affinetform2d.outputLimits     - Find output spatial limits given input spatial limits
affinetform2d.transformPointsInverse - Apply inverse geometric transformation
sym.gegenbauerC                - Gegenbauer polynomials
sym.jacobiP                    - Jacobi polynomials
sym.laguerreL                  - Generalized Laguerre Function and Laguerre Polynomials
sym.minpoly                    - Minimal polynomial of matrix
sym.polynomialDegree           - Degree of polynomial
sym.polynomialReduce           - Reduce polynomials by division
sym.resultant                  - Resultant of two polynomials
images.geotrans.PolynomialTransformation2D.A - Polynomial coefficients used to determine U in the inverse transformation
images.geotrans.PolynomialTransformation2D.B - Polynomial coefficients used to determine V in the inverse transformation
images.geotrans.PolynomialTransformation2D.Degree - Degree of polynomial transformation
images.geotrans.PolynomialTransformation2D.Dimensionality - Dimensionality of geometric transformation

>> lookfor fitting
polytool                       - Interactive polynomial fitting
Neural Net Fitting             - Solve fitting problem using two-layer feed-forward networks
ClassificationECOC.RowsUsed    - Rows used in fitting
ClassificationGAM.RowsUsed     - Rows used in fitting
CoxModel.VariableInfo          - Information about fitting data
FeatureSelectionNCAClassification.FitMethod - Name of fitting method
FeatureSelectionNCARegression.FitMethod - Name of the fitting method used to fit this model
GeneralizedLinearModel.Steps   - Stepwise fitting information
NonLinearModel.Iterative       - Information about fitting process
prob.BirnbaumSaundersDistribution.InputData - Data used for distribution fitting
prob.GeneralizedExtremeValueDistribution.InputData - Data used for distribution fitting
prob.HalfNormalDistribution.InputData - Data used for distribution fitting
prob.LoglogisticDistribution.InputData - Data used for distribution fitting
ReconstructionICA.FitInfo      - Fitting history
RegressionGAM.RowsUsed         - Rows used in fitting
SparseFiltering.FitInfo        - Fitting history

Am I missing something? First line of reference page of polyfit do have 'polynomial' and 'fitting'.

>> help polyfit
 polyfit - Polynomial curve fitting
    This MATLAB function returns the coefficients for a polynomial p(x) of
    degree n that is a best fit (in a least-squares sense) for the data in
    y.

[Matt J]

It works when we run it here. Something in your environment, perhaps.

lookfor polynomial

conv                           - Convolution and polynomial multiplication
deconv                         - Least-squares deconvolution and polynomial division
detrend                        - Remove polynomial trend
mkpp                           - Make piecewise polynomial
pchip                          - Piecewise Cubic Hermite Interpolating Polynomial (PCHIP)
poly                           - Polynomial with specified roots or characteristic polynomial
polyder                        - Polynomial differentiation
polyeig                        - Polynomial eigenvalue problem
polyfit                        - Polynomial curve fitting
polyint                        - Polynomial integration
polyval                        - Polynomial evaluation
polyvalm                       - Matrix polynomial evaluation
ppval                          - Evaluate piecewise polynomial
roots                          - Polynomial roots
unmkpp                         - Extract piecewise polynomial details
Find and Remove Trends         - Find and remove polynomial or periodic trends from data in the Live Editor
Polynomial                     - Perform evaluation of polynomial coefficients on input values
mssgolay                       - Smooth signal with peaks using least-squares polynomial
bchgenpoly                     - Produce generator polynomials for BCH code
cyclpoly                       - Produce generator polynomials for binary cyclic code
gfadd                          - Add polynomials over Galois field
gfconv                         - Multiply polynomials over Galois field
gfdeconv                       - Divide polynomials over Galois field
gffilter (prime Galois field)  - Filter data using polynomials over prime Galois field
gfminpol                       - Find minimal polynomial of Galois field element
gfpretty                       - Polynomial in traditional format
gfprimck                       - Check whether polynomial over Galois field is primitive
gfprimdf                       - Provide default primitive polynomials for Galois field
gfprimfd                       - Find primitive polynomials for Galois field
gfrepcov                       - Convert one binary polynomial representation to another
gfroots                        - Find roots of polynomial over prime Galois field
gfsub                          - Subtract polynomials over Galois field
gftrunc                        - Minimize length of polynomial representation
isprimitive                    - True for primitive polynomial for Galois field
minpol                         - Find minimal polynomial of Galois field element
poly2trellis                   - Convert convolutional code polynomials to trellis description
primpoly                       - Find primitive polynomials for Galois field
rsgenpoly                      - Generator polynomial of Reed-Solomon code
rsgenpolycoeffs                - Generator polynomial coefficients of Reed-Solomon code
polyBasis                      - Polynomial basis functions for tunable gain surface
bspline                        - Plot B-spline and its polynomial pieces
fdesign.polysrc                - Construct polynomial sample-rate converter (POLYSRC) filter designer
conv                           - Convolution and polynomial multiplication of fi objects
bj                             - Estimate Box-Jenkins polynomial model using time-domain data
idPolynomial1D                 - Class representing single-variable polynomial nonlinear estimator for Hammerstein-Wiener models
oe                             - Estimate output-error polynomial model using time-domain or frequency-domain data
polyest                        - Estimate polynomial model using time- or frequency-domain data
recursiveBJ                    - Create System object for online parameter estimation of Box-Jenkins polynomial model
recursiveOE                    - Create System object for online parameter estimation of Output-Error polynomial model
images.geotrans.PolynomialTransformation2D - 2-D polynomial geometric transformation
map.geotiff.RPCCoefficientTag  - Rational Polynomial Coefficients Tag
bsplinepolytraj                - Generate polynomial trajectories using B-splines
cubicpolytraj                  - Generate third-order polynomial trajectories
ac2poly                        - Convert autocorrelation sequence to prediction polynomial
poly2ac                        - Convert prediction filter polynomial to autocorrelation sequence
poly2rc                        - Convert prediction filter polynomial to reflection coefficients
polyscale                      - Scale roots of polynomial
polystab                       - Stabilize polynomial
rc2poly                        - Convert reflection coefficients to prediction filter polynomial
polyconf                       - Polynomial confidence intervals
polytool                       - Interactive polynomial fitting
bernstein                      - Bernstein polynomials
gcd                            - GCD of numbers and polynomials
fitPolynomialRANSAC            - Fit polynomial to points using RANSAC
filters2lp                     - Filters to Laurent polynomials
imlpt                          - Inverse multiscale local 1-D polynomial transform
mlpt                           - Multiscale local 1-D polynomial transform
mlptdenoise                    - Denoise signal using multiscale local 1-D polynomial transform
mlptrecon                      - Reconstruct signal using inverse multiscale local 1-D polynomial transform
wave2lp                        - Laurent polynomials associated with wavelet
comm.DPDCoefficientEstimator   - Estimate memory-polynomial coefficients for digital predistortion
dsp.FarrowRateConverter        - Polynomial sample rate converter with arbitrary conversion factor
dsphdl.FarrowRateConverter     - Polynomial sample-rate converter
LagOp                          - Create lag operator polynomial
idpoly                         - Polynomial model with identifiable parameters
polynomialRegressor            - Specify polynomial regressor for nonlinear ARX model
polynomialTrajectory           - Piecewise-polynomial trajectory generator
polynomialTrajectory           - Piecewise-polynomial trajectory generator
laurentPolynomial              - Create Laurent polynomial
dsp.FarrowRateConverter.getPolynomialCoefficients - Get polynomial coefficients of farrow rate conversion filter
idgrey.polydata                - Access polynomial coefficients and uncertainties of identified model
idpoly.setPolyFormat           - Specify format for B and F polynomials of multi-input polynomial model
affinetform2d.outputLimits     - Find output spatial limits given input spatial limits
affinetform2d.transformPointsInverse - Apply inverse geometric transformation
polynomialTrajectory.lookupPose - Obtain pose information for certain time
polynomialTrajectory.waypointInfo - Get waypoint information table
sym.bernoulli                  - Bernoulli numbers and polynomials
sym.charpoly                   - Characteristic polynomial of matrix
sym.chebyshevT                 - Chebyshev polynomials of the first kind
sym.chebyshevU                 - Chebyshev polynomials of the second kind
sym.coeffs                     - Coefficients of polynomial
sym.euler                      - Euler numbers and polynomials
sym.gegenbauerC                - Gegenbauer polynomials
sym.hermiteH                   - Hermite polynomials
sym.horner                     - Horner nested polynomial representation
sym.jacobiP                    - Jacobi polynomials
sym.laguerreL                  - Generalized Laguerre Function and Laguerre Polynomials
sym.legendreP                  - Legendre polynomials
sym.minpoly                    - Minimal polynomial of matrix
sym.poly2sym                   - Create symbolic polynomial from vector of coefficients
sym.polynomialDegree           - Degree of polynomial
sym.polynomialReduce           - Reduce polynomials by division
sym.resultant                  - Resultant of two polynomials
sym.root                       - Represent roots of polynomial
sym.sym2poly                   - Extract vector of all numeric coefficients, including zeros, from symbolic polynomial
polynomialTrajectory.lookupPose - Obtain pose information for certain time
polynomialTrajectory.waypointInfo - Get waypoint information table
laurentPolynomial.degree       - Degree of Laurent polynomial
laurentPolynomial.dyaddown     - Dyadic downsampling of Laurent polynomial or Laurent matrix
laurentPolynomial.dyadup       - Dyadic upsampling of Laurent polynomial or Laurent matrix
laurentPolynomial.eq           - Laurent polynomials or Laurent matrices equality test
laurentPolynomial.euclid       - Euclidean algorithm for Laurent polynomials
laurentPolynomial.horzcat      - Horizontal concatenation of Laurent polynomials
laurentPolynomial.lp2filters   - Laurent polynomials to filters
laurentPolynomial.lp2LS        - Laurent polynomials to lifting steps and normalization factors
laurentPolynomial.minus        - Laurent polynomial or Laurent matrix subtraction
laurentPolynomial.mpower       - Laurent polynomial exponentiation
laurentPolynomial.mtimes       - Laurent polynomial or Laurent matrix multiplication
laurentPolynomial.ne           - Laurent polynomials inequality test
laurentPolynomial.plus         - Laurent polynomial or Laurent matrix addition
laurentPolynomial.polyphase    - Polyphase components of Laurent polynomial
laurentPolynomial.reflect      - Laurent polynomial or Laurent matrix reflection
laurentPolynomial.rescale      - Rescale Laurent polynomial
laurentPolynomial.uminus       - Unary minus for Laurent polynomial or Laurent matrix
laurentPolynomial.vertcat      - Vertical concatenation of Laurent polynomials
LagOp.filter                   - Apply lag operator polynomial to filter time series
LagOp.isEqLagOp                - Determine if two LagOp objects are same mathematical polynomial
LagOp.isStable                 - Determine stability of lag operator polynomial
LagOp.minus                    - Lag operator polynomial subtraction
LagOp.mldivide                 - Lag operator polynomial left division
LagOp.mrdivide                 - Lag operator polynomial right division
LagOp.mtimes                   - Lag operator polynomial multiplication
LagOp.plus                     - Lag operator polynomial addition
LagOp.reflect                  - Reflect lag operator polynomial coefficients around lag zero
LagOp.toCellArray              - Convert lag operator polynomial object to cell array
comm.BCHDecoder.GeneratorPolynomialSource - Source of generator polynomial
comm.BCHDecoder.GeneratorPolynomial - Generator polynomial
comm.BCHDecoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.BCHDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.BCHDecoder.PrimitivePolynomial - Primitive polynomial
comm.BCHEncoder.GeneratorPolynomialSource - Source of generator polynomial
comm.BCHEncoder.GeneratorPolynomial - Generator polynomial
comm.BCHEncoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.BCHEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.BCHEncoder.PrimitivePolynomial - Primitive polynomial
comm.CRCDetector.Polynomial    - Generator polynomial
comm.CRCGenerator.Polynomial   - Generator polynomial
comm.Descrambler.Polynomial    - Connections for linear feedback shift registers
comm.DPD.PolynomialType        - Polynomial type
comm.DPD.Coefficients          - Memory-polynomial coefficients
comm.DPDCoefficientEstimator.PolynomialType - Polynomial type
comm.DPDCoefficientEstimator.Degree - Memory-polynomial degree
comm.DPDCoefficientEstimator.MemoryDepth - Memory-polynomial depth
comm.GoldSequence.FirstPolynomial - Generator polynomial for first preferred PN sequence
comm.GoldSequence.SecondPolynomial - Generator polynomial for second preferred PN sequence
comm.HDLCRCDetector.Polynomial - Generator polynomial
comm.HDLCRCGenerator.Polynomial - Generator polynomial
comm.HDLRSDecoder.B            - Starting power for roots of primitive polynomial
comm.HDLRSDecoder.BSource      - Source of starting power for roots of primitive polynomial
comm.HDLRSDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.HDLRSDecoder.PrimitivePolynomial - Primitive polynomial
comm.HDLRSEncoder.B            - Starting power for roots of primitive polynomial
comm.HDLRSEncoder.BSource      - Source of starting power for roots of primitive polynomial
comm.HDLRSEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.HDLRSEncoder.PrimitivePolynomial - Primitive polynomial
comm.KasamiSequence.Polynomial - Generator polynomial
comm.MemorylessNonlinearity.TOISpecification - Third-order nonlinearity specification for cubic polynomial
comm.PNSequence.Polynomial     - Generator polynomial
comm.RSDecoder.GeneratorPolynomialSource - Source of generator polynomial
comm.RSDecoder.GeneratorPolynomial - Generator polynomial
comm.RSDecoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.RSDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.RSDecoder.PrimitivePolynomial - Primitive polynomial
comm.RSEncoder.GeneratorPolynomialSource - Source of generator polynomial
comm.RSEncoder.GeneratorPolynomial - Generator polynomial
comm.RSEncoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.RSEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.RSEncoder.PrimitivePolynomial - Primitive polynomial
comm.Scrambler.Polynomial      - Connections for linear feedback shift registers
zpk.DisplayFormat              - Specifies how the numerator and denominator polynomials are factorized for display
dsp.AllpassFilter.AllpassCoefficients - Allpass polynomial coefficients
dsp.CoupledAllpassFilter.AllpassCoefficients1 - Allpass polynomial coefficients of branch 1
dsp.CoupledAllpassFilter.AllpassCoefficients2 - Allpass polynomial coefficients of branch 2
dsp.FarrowRateConverter.PolynomialOrder - Order of Lagrange-interpolation-filter polynomial
dsp.FarrowRateConverter.Coefficients - Filter polynomial coefficients
dsp.IIRHalfbandDecimator.AllpassCoefficients1 - Allpass polynomial filter coefficients of first branch
dsp.IIRHalfbandDecimator.AllpassCoefficients2 - Allpass polynomial filter coefficients of second branch
dsp.IIRHalfbandInterpolator.AllpassCoefficients1 - Allpass polynomial filter coefficients of first branch
dsp.IIRHalfbandInterpolator.AllpassCoefficients2 - Allpass polynomial filter coefficients of second branch
dsp.VariableFractionalDelay.ProductPolynomialValueDataType - Data type of the product polynomial value
dsp.VariableFractionalDelay.CustomProductPolynomialValueDataType - Word and fraction lengths of product polynomial value
dsp.VariableFractionalDelay.AccumulatorPolynomialValueDataType - Data type of the accumulator polynomial value
dsp.VariableFractionalDelay.CustomAccumulatorPolynomialValueDataType - Word and fraction lengths of accumulator polynomial value
dsp.VariableFractionalDelay.MultiplicandPolynomialValueDataType - Data type of multiplicand polynomial value
dsp.VariableFractionalDelay.CustomMultiplicandPolynomialValueDataType - Word and fraction lengths of multiplicand polynomial value
arima.P                        - Compound AR polynomial degree
arima.Q                        - Compound MA polynomial degree
arima.AR                       - Nonseasonal AR polynomial coefficients
arima.SAR                      - Seasonal AR polynomial coefficients
arima.MA                       - Nonseasonal MA polynomial coefficients
arima.SMA                      - Seasonal MA polynomial coefficients
arima.Seasonality              - Degree of seasonal differencing polynomial
conjugatebvarm.P               - Multivariate autoregressive polynomial order
diffusebvarm.P                 - Multivariate autoregressive polynomial order
egarch.P                       - GARCH polynomial degree
egarch.Q                       - Maximum degree of ARCH and leverage polynomials
egarch.GARCH                   - GARCH polynomial coefficients
egarch.ARCH                    - ARCH polynomial coefficients
egarch.Leverage                - Leverage polynomial coefficients
empiricalbvarm.P               - Multivariate autoregressive polynomial order
garch.P                        - GARCH polynomial degree
garch.Q                        - ARCH polynomial degree
garch.GARCH                    - GARCH polynomial coefficients
garch.ARCH                     - ARCH polynomial coefficients
gjr.P                          - GARCH polynomial degree
gjr.Q                          - Maximum degree of ARCH and leverage polynomials
gjr.GARCH                      - GARCH polynomial coefficients
gjr.ARCH                       - ARCH polynomial coefficients
gjr.Leverage                   - Leverage polynomial coefficients
LagOp.Coefficients             - Lag operator polynomial coefficients
LagOp.Degree                   - Polynomial degree p
LagOp.Dimension                - Polynomial dimension m
LagOp.Lags                     - Polynomial lags associated with nonzero coefficients
normalbvarm.P                  - Multivariate autoregressive polynomial order
regARIMA.P                     - Compound AR polynomial degree
regARIMA.Q                     - Compound MA polynomial degree
regARIMA.AR                    - Nonseasonal AR polynomial coefficients ϕ
regARIMA.MA                    - Nonseasonal MA polynomial coefficients θ
regARIMA.SAR                   - Seasonal AR polynomial coefficients Φ
regARIMA.SMA                   - Seasonal MA polynomial coefficients
regARIMA.Seasonality           - Degree of seasonal differencing polynomial
semiconjugatebvarm.P           - Multivariate autoregressive polynomial order
varm.P                         - Multivariate autoregressive polynomial order
idpoly.A                       - Values of polynomial coefficients
idpoly.B                       - Values of polynomial coefficients
idpoly.C                       - Values of polynomial coefficients
idpoly.D                       - Values of polynomial coefficients
idpoly.F                       - Values of polynomial coefficients
idpoly.Variable                - Polynomial model display variable
idSupportVectorMachine.Polynomial Order - Polynomial kernel function order
polynomialRegressor.Variables  - Output and input variable names
polynomialRegressor.Lags       - Lags in each variable
polynomialRegressor.UseAbsolute - Absolute value indicator
polynomialRegressor.AllowVariableMix - Mixed variables indicator
polynomialRegressor.AllowLagMix - Mixed lag indicator
polynomialRegressor.TimeVariable - Name of time variable
images.geotrans.PolynomialTransformation2D.A - Polynomial coefficients used to determine U in the inverse transformation
images.geotrans.PolynomialTransformation2D.B - Polynomial coefficients used to determine V in the inverse transformation
images.geotrans.PolynomialTransformation2D.Degree - Degree of polynomial transformation
images.geotrans.PolynomialTransformation2D.Dimensionality - Dimensionality of geometric transformation
map.geotiff.RPCCoefficientTag.LineNumeratorCoefficients - Coefficients for the polynomial in the numerator of the r(n) equation
map.geotiff.RPCCoefficientTag.LineDenominatorCoefficients - Coefficients for the polynomial in the denominator of the r(n) equation
map.geotiff.RPCCoefficientTag.SampleNumeratorCoefficients - Coefficients for the polynomial in the numerator of the c(n) equation
map.geotiff.RPCCoefficientTag.SampleDenominatorCoefficients - Coefficients for the polynomial in the denominator of the c(n) equation
pde.FEMesh.GeometricOrder      - Element polynomial order
phased.NonlinearFMWaveform.PolynomialCoefficients - Coefficients of polynomial frequency function
polynomialTrajectory.SampleRate - Sample rate of trajectory (Hz)
polynomialTrajectory.SamplesPerFrame - Number of samples per output frame
polynomialTrajectory.Orientation - Orientation at each waypoint
polynomialTrajectory.Waypoints - Positions in navigation coordinate system (m)
polynomialTrajectory.TimeOfArrival - Timestamp at each waypoint (s)
polynomialTrajectory.AutoPitch - Align pitch angle with direction of motion
polynomialTrajectory.AutoBank  - Align roll angle to counteract centripetal force
polynomialTrajectory.ReferenceFrame - Reference frame of trajectory
polynomialTrajectory.Velocities - Velocity in navigation coordinate system at each waypoint (m/s)
polynomialTrajectory.Course    - Horizontal direction of travel (degrees)
polynomialTrajectory.GroundSpeed - Groundspeed at each waypoint (m/s)
polynomialTrajectory.ClimbRate - Climb rate at each waypoint (m/s)
dvbrcs2RecoveryConfig.ScramblingPolynomial - Scrambling polynomial
dvbrcs2WaveformGenerator.ScramblingPolynomial - Scrambling polynomial
polynomialTrajectory.SampleRate - Sample rate of trajectory (Hz)
polynomialTrajectory.SamplesPerFrame - Number of samples per output frame
polynomialTrajectory.Orientation - Orientation at each waypoint
polynomialTrajectory.Waypoints - Positions in navigation coordinate system (m)
polynomialTrajectory.TimeOfArrival - Timestamp at each waypoint (s)
polynomialTrajectory.AutoPitch - Align pitch angle with direction of motion
polynomialTrajectory.AutoBank  - Align roll angle to counteract centripetal force
polynomialTrajectory.ReferenceFrame - Reference frame of trajectory
polynomialTrajectory.Velocities - Velocity in navigation coordinate system at each waypoint (m/s)
polynomialTrajectory.Course    - Horizontal direction of travel (degrees)
polynomialTrajectory.GroundSpeed - Groundspeed at each waypoint (m/s)
polynomialTrajectory.ClimbRate - Climb rate at each waypoint (m/s)
fisheyeIntrinsics.MappingCoefficients - Polynomial coefficients for projection function
laurentPolynomial.Coefficients - Laurent polynomial coefficients
laurentPolynomial.MaxOrder     - Maximum order
DPD Coefficient Estimator      - Estimate memory-polynomial coefficients for digital predistortion
General CRC Generator          - Generate CRC code bits according to generator polynomial and append to input data frames
General CRC Syndrome Detector  - Detect errors in received codeword frames according to generator polynomial
Farrow Rate Converter          - Polynomial sample-rate converter with arbitrary conversion factor
Least Squares Polynomial Fit   - Compute polynomial coefficients that best fit input data in least-squares sense
Polynomial Evaluation          - Evaluate polynomial expression
Polynomial Stability Test      - Use Schur-Cohn algorithm to determine whether all roots of input polynomial are inside unit circle
Farrow Rate Converter          - Polynomial sample-rate converter
Model Type Converter           - Convert polynomial model coefficients to state-space model matrices
Recursive Polynomial Model Estimator - Estimate input-output and time-series polynomial model coefficients
Minimum Jerk Polynomial Trajectory - Generate minimum jerk polynomial trajectories through multiple waypoints
Minimum Snap Polynomial Trajectory - Generate minimum snap polynomial trajectories through multiple waypoints
Polynomial Trajectory          - Generate polynomial trajectories through waypoints
RST Controller                 - Predictive control using a polynomial representation
Minimum Jerk Polynomial Trajectory - Generate minimum jerk polynomial trajectories through multiple waypoints
Minimum Snap Polynomial Trajectory - Generate minimum snap polynomial trajectories through multiple waypoints
Nonlinear Rotational Spring    - Torsional spring based on polynomial or table lookup parameterizations
Nonlinear Translational Spring - Translational spring based on polynomial or table lookup parameterizations
PCCCS                          - Polynomial current-controlled current source
PCCCS2                         - Polynomial current-controlled current source with two controlling inputs
PCCVS                          - Polynomial current-controlled voltage source
PCCVS2                         - Polynomial current-controlled voltage source with two controlling inputs
PVCCS                          - Polynomial voltage-controlled current source
PVCCS2                         - Polynomial voltage-controlled current source with two controlling inputs
PVCVS                          - Polynomial voltage-controlled voltage source
PVCVS2                         - Polynomial voltage-controlled voltage source with two controlling inputs
laurpoly                       - (To be removed) Laurent polynomials constructor

lookfor fitting

polyfit                        - Polynomial curve fitting
fittype                        - Fit type for curve and surface fitting
prepareCurveData               - Prepare data inputs for curve fitting
prepareSurfaceData             - Prepare data inputs for surface fitting
fitnet                         - Function fitting neural network
nftool                         - Open Neural Net Fitting app
lsqcurvefit                    - Solve nonlinear curve-fitting (data-fitting) problems in least-squares sense
lsqnonlin                      - Solve nonlinear least-squares (nonlinear data-fitting) problems
polytool                       - Interactive polynomial fitting
IRFitOptions                   - Construct specific options for fitting interest-rate curve object
rfckt.rational                 - Perform rational fitting to complex frequency-dependent data
groupedData                    - Table-like collection of data and metadata for fitting in SimBiology
ldaModel.resume                - Resume fitting LDA model
Neural Net Fitting             - Solve fitting problem using two-layer feed-forward networks
IRFitOptions.FitType           - Minimize by in curve fitting process
rctoptions.dksyn.AutoScalingOrder - State order for fitting scaling data for mixed mu-synthesis
fitproblem.Doses               - Doses applied during fitting
fitproblem.Variants            - Variants applied during fitting
fitproblem.Weights             - Weights used during fitting
NLINResults.Data               - Data used for fitting
NLMEResults.Data               - Data used for fitting
OptimResults.Data              - Data used for fitting
SimBiology.fit.ConfidenceInterval.GroupNames - Original group names from data used for fitting
SimBiology.fit.LeastSquaresResults.Data - Data used for fitting
SimBiology.fit.ParameterConfidenceInterval.GroupNames - Original group names from data used for fitting
SimBiology.fit.PredictionConfidenceInterval.GroupNames - Original group names from data used for fitting
ClassificationECOC.RowsUsed    - Rows used in fitting
ClassificationGAM.RowsUsed     - Rows used in fitting
ClassificationKNN.RowsUsed     - Rows used in fitting
CoxModel.VariableInfo          - Information about fitting data
FeatureSelectionNCAClassification.FitMethod - Name of fitting method
FeatureSelectionNCARegression.FitMethod - Name of the fitting method used to fit this model
GeneralizedLinearModel.Steps   - Stepwise fitting information
LinearModel.Steps              - Stepwise fitting information
NonLinearModel.Iterative       - Information about fitting process
prob.BetaDistribution.InputData - Data used for distribution fitting
prob.BinomialDistribution.InputData - Data used for distribution fitting
prob.BirnbaumSaundersDistribution.InputData - Data used for distribution fitting
prob.BurrDistribution.InputData - Data used for distribution fitting
prob.ExponentialDistribution.InputData - Data used for distribution fitting
prob.ExtremeValueDistribution.InputData - Data used for distribution fitting
prob.GammaDistribution.InputData - Data used for distribution fitting
prob.GeneralizedExtremeValueDistribution.InputData - Data used for distribution fitting
prob.GeneralizedParetoDistribution.InputData - Data used for distribution fitting
prob.HalfNormalDistribution.InputData - Data used for distribution fitting
prob.InverseGaussianDistribution.InputData - Data used for distribution fitting
prob.KernelDistribution.InputData - Data used for distribution fitting
prob.LogisticDistribution.InputData - Data used for distribution fitting
prob.LoglogisticDistribution.InputData - Data used for distribution fitting
prob.LognormalDistribution.InputData - Data used for distribution fitting
prob.NakagamiDistribution.InputData - Data used for distribution fitting
prob.NegativeBinomialDistribution.InputData - Data used for distribution fitting
prob.NormalDistribution.InputData - Data used for distribution fitting
prob.PoissonDistribution.InputData - Data used for distribution fitting
prob.RayleighDistribution.InputData - Data used for distribution fitting
prob.RicianDistribution.InputData - Data used for distribution fitting
prob.StableDistribution.InputData - Data used for distribution fitting
prob.tLocationScaleDistribution.InputData - Data used for distribution fitting
prob.WeibullDistribution.InputData - Data used for distribution fitting
ReconstructionICA.FitInfo      - Fitting history
RegressionGAM.RowsUsed         - Rows used in fitting
SparseFiltering.FitInfo        - Fitting history
ldaModel.FitInfo               - Information recorded when fitting LDA model
Root WSF DOA                   - Root weighted subspace fitting (WSF) direction of arrival (DOA) estimator for ULA
sftool                         - (Removed) Open Curve Fitting app

[dpb]

lookfor polynomial

conv                           - Convolution and polynomial multiplication
deconv                         - Least-squares deconvolution and polynomial division
detrend                        - Remove polynomial trend
mkpp                           - Make piecewise polynomial
pchip                          - Piecewise Cubic Hermite Interpolating Polynomial (PCHIP)
poly                           - Polynomial with specified roots or characteristic polynomial
polyder                        - Polynomial differentiation
polyeig                        - Polynomial eigenvalue problem
polyfit                        - Polynomial curve fitting
polyint                        - Polynomial integration
polyval                        - Polynomial evaluation
polyvalm                       - Matrix polynomial evaluation
ppval                          - Evaluate piecewise polynomial
roots                          - Polynomial roots
unmkpp                         - Extract piecewise polynomial details
Find and Remove Trends         - Find and remove polynomial or periodic trends from data in the Live Editor
Polynomial                     - Perform evaluation of polynomial coefficients on input values
mssgolay                       - Smooth signal with peaks using least-squares polynomial
bchgenpoly                     - Produce generator polynomials for BCH code
cyclpoly                       - Produce generator polynomials for binary cyclic code
gfadd                          - Add polynomials over Galois field
gfconv                         - Multiply polynomials over Galois field
gfdeconv                       - Divide polynomials over Galois field
gffilter (prime Galois field)  - Filter data using polynomials over prime Galois field
gfminpol                       - Find minimal polynomial of Galois field element
gfpretty                       - Polynomial in traditional format
gfprimck                       - Check whether polynomial over Galois field is primitive
gfprimdf                       - Provide default primitive polynomials for Galois field
gfprimfd                       - Find primitive polynomials for Galois field
gfrepcov                       - Convert one binary polynomial representation to another
gfroots                        - Find roots of polynomial over prime Galois field
gfsub                          - Subtract polynomials over Galois field
gftrunc                        - Minimize length of polynomial representation
isprimitive                    - True for primitive polynomial for Galois field
minpol                         - Find minimal polynomial of Galois field element
poly2trellis                   - Convert convolutional code polynomials to trellis description
primpoly                       - Find primitive polynomials for Galois field
rsgenpoly                      - Generator polynomial of Reed-Solomon code
rsgenpolycoeffs                - Generator polynomial coefficients of Reed-Solomon code
polyBasis                      - Polynomial basis functions for tunable gain surface
bspline                        - Plot B-spline and its polynomial pieces
fdesign.polysrc                - Construct polynomial sample-rate converter (POLYSRC) filter designer
conv                           - Convolution and polynomial multiplication of fi objects
bj                             - Estimate Box-Jenkins polynomial model using time-domain data
idPolynomial1D                 - Class representing single-variable polynomial nonlinear estimator for Hammerstein-Wiener models
oe                             - Estimate output-error polynomial model using time-domain or frequency-domain data
polyest                        - Estimate polynomial model using time- or frequency-domain data
recursiveBJ                    - Create System object for online parameter estimation of Box-Jenkins polynomial model
recursiveOE                    - Create System object for online parameter estimation of Output-Error polynomial model
images.geotrans.PolynomialTransformation2D - 2-D polynomial geometric transformation
map.geotiff.RPCCoefficientTag  - Rational Polynomial Coefficients Tag
bsplinepolytraj                - Generate polynomial trajectories using B-splines
cubicpolytraj                  - Generate third-order polynomial trajectories
ac2poly                        - Convert autocorrelation sequence to prediction polynomial
poly2ac                        - Convert prediction filter polynomial to autocorrelation sequence
poly2rc                        - Convert prediction filter polynomial to reflection coefficients
polyscale                      - Scale roots of polynomial
polystab                       - Stabilize polynomial
rc2poly                        - Convert reflection coefficients to prediction filter polynomial
polyconf                       - Polynomial confidence intervals
polytool                       - Interactive polynomial fitting
bernstein                      - Bernstein polynomials
gcd                            - GCD of numbers and polynomials
fitPolynomialRANSAC            - Fit polynomial to points using RANSAC
filters2lp                     - Filters to Laurent polynomials
imlpt                          - Inverse multiscale local 1-D polynomial transform
mlpt                           - Multiscale local 1-D polynomial transform
mlptdenoise                    - Denoise signal using multiscale local 1-D polynomial transform
mlptrecon                      - Reconstruct signal using inverse multiscale local 1-D polynomial transform
wave2lp                        - Laurent polynomials associated with wavelet
comm.DPDCoefficientEstimator   - Estimate memory-polynomial coefficients for digital predistortion
dsp.FarrowRateConverter        - Polynomial sample rate converter with arbitrary conversion factor
dsphdl.FarrowRateConverter     - Polynomial sample-rate converter
LagOp                          - Create lag operator polynomial
idpoly                         - Polynomial model with identifiable parameters
polynomialRegressor            - Specify polynomial regressor for nonlinear ARX model
polynomialTrajectory           - Piecewise-polynomial trajectory generator
polynomialTrajectory           - Piecewise-polynomial trajectory generator
laurentPolynomial              - Create Laurent polynomial
dsp.FarrowRateConverter.getPolynomialCoefficients - Get polynomial coefficients of farrow rate conversion filter
idgrey.polydata                - Access polynomial coefficients and uncertainties of identified model
idpoly.setPolyFormat           - Specify format for B and F polynomials of multi-input polynomial model
affinetform2d.outputLimits     - Find output spatial limits given input spatial limits
affinetform2d.transformPointsInverse - Apply inverse geometric transformation
polynomialTrajectory.lookupPose - Obtain pose information for certain time
polynomialTrajectory.waypointInfo - Get waypoint information table
sym.bernoulli                  - Bernoulli numbers and polynomials
sym.charpoly                   - Characteristic polynomial of matrix
sym.chebyshevT                 - Chebyshev polynomials of the first kind
sym.chebyshevU                 - Chebyshev polynomials of the second kind
sym.coeffs                     - Coefficients of polynomial
sym.euler                      - Euler numbers and polynomials
sym.gegenbauerC                - Gegenbauer polynomials
sym.hermiteH                   - Hermite polynomials
sym.horner                     - Horner nested polynomial representation
sym.jacobiP                    - Jacobi polynomials
sym.laguerreL                  - Generalized Laguerre Function and Laguerre Polynomials
sym.legendreP                  - Legendre polynomials
sym.minpoly                    - Minimal polynomial of matrix
sym.poly2sym                   - Create symbolic polynomial from vector of coefficients
sym.polynomialDegree           - Degree of polynomial
sym.polynomialReduce           - Reduce polynomials by division
sym.resultant                  - Resultant of two polynomials
sym.root                       - Represent roots of polynomial
sym.sym2poly                   - Extract vector of all numeric coefficients, including zeros, from symbolic polynomial
polynomialTrajectory.lookupPose - Obtain pose information for certain time
polynomialTrajectory.waypointInfo - Get waypoint information table
laurentPolynomial.degree       - Degree of Laurent polynomial
laurentPolynomial.dyaddown     - Dyadic downsampling of Laurent polynomial or Laurent matrix
laurentPolynomial.dyadup       - Dyadic upsampling of Laurent polynomial or Laurent matrix
laurentPolynomial.eq           - Laurent polynomials or Laurent matrices equality test
laurentPolynomial.euclid       - Euclidean algorithm for Laurent polynomials
laurentPolynomial.horzcat      - Horizontal concatenation of Laurent polynomials
laurentPolynomial.lp2filters   - Laurent polynomials to filters
laurentPolynomial.lp2LS        - Laurent polynomials to lifting steps and normalization factors
laurentPolynomial.minus        - Laurent polynomial or Laurent matrix subtraction
laurentPolynomial.mpower       - Laurent polynomial exponentiation
laurentPolynomial.mtimes       - Laurent polynomial or Laurent matrix multiplication
laurentPolynomial.ne           - Laurent polynomials inequality test
laurentPolynomial.plus         - Laurent polynomial or Laurent matrix addition
laurentPolynomial.polyphase    - Polyphase components of Laurent polynomial
laurentPolynomial.reflect      - Laurent polynomial or Laurent matrix reflection
laurentPolynomial.rescale      - Rescale Laurent polynomial
laurentPolynomial.uminus       - Unary minus for Laurent polynomial or Laurent matrix
laurentPolynomial.vertcat      - Vertical concatenation of Laurent polynomials
LagOp.filter                   - Apply lag operator polynomial to filter time series
LagOp.isEqLagOp                - Determine if two LagOp objects are same mathematical polynomial
LagOp.isStable                 - Determine stability of lag operator polynomial
LagOp.minus                    - Lag operator polynomial subtraction
LagOp.mldivide                 - Lag operator polynomial left division
LagOp.mrdivide                 - Lag operator polynomial right division
LagOp.mtimes                   - Lag operator polynomial multiplication
LagOp.plus                     - Lag operator polynomial addition
LagOp.reflect                  - Reflect lag operator polynomial coefficients around lag zero
LagOp.toCellArray              - Convert lag operator polynomial object to cell array
comm.BCHDecoder.GeneratorPolynomialSource - Source of generator polynomial
comm.BCHDecoder.GeneratorPolynomial - Generator polynomial
comm.BCHDecoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.BCHDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.BCHDecoder.PrimitivePolynomial - Primitive polynomial
comm.BCHEncoder.GeneratorPolynomialSource - Source of generator polynomial
comm.BCHEncoder.GeneratorPolynomial - Generator polynomial
comm.BCHEncoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.BCHEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.BCHEncoder.PrimitivePolynomial - Primitive polynomial
comm.CRCDetector.Polynomial    - Generator polynomial
comm.CRCGenerator.Polynomial   - Generator polynomial
comm.Descrambler.Polynomial    - Connections for linear feedback shift registers
comm.DPD.PolynomialType        - Polynomial type
comm.DPD.Coefficients          - Memory-polynomial coefficients
comm.DPDCoefficientEstimator.PolynomialType - Polynomial type
comm.DPDCoefficientEstimator.Degree - Memory-polynomial degree
comm.DPDCoefficientEstimator.MemoryDepth - Memory-polynomial depth
comm.GoldSequence.FirstPolynomial - Generator polynomial for first preferred PN sequence
comm.GoldSequence.SecondPolynomial - Generator polynomial for second preferred PN sequence
comm.HDLCRCDetector.Polynomial - Generator polynomial
comm.HDLCRCGenerator.Polynomial - Generator polynomial
comm.HDLRSDecoder.B            - Starting power for roots of primitive polynomial
comm.HDLRSDecoder.BSource      - Source of starting power for roots of primitive polynomial
comm.HDLRSDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.HDLRSDecoder.PrimitivePolynomial - Primitive polynomial
comm.HDLRSEncoder.B            - Starting power for roots of primitive polynomial
comm.HDLRSEncoder.BSource      - Source of starting power for roots of primitive polynomial
comm.HDLRSEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.HDLRSEncoder.PrimitivePolynomial - Primitive polynomial
comm.KasamiSequence.Polynomial - Generator polynomial
comm.MemorylessNonlinearity.TOISpecification - Third-order nonlinearity specification for cubic polynomial
comm.PNSequence.Polynomial     - Generator polynomial
comm.RSDecoder.GeneratorPolynomialSource - Source of generator polynomial
comm.RSDecoder.GeneratorPolynomial - Generator polynomial
comm.RSDecoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.RSDecoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.RSDecoder.PrimitivePolynomial - Primitive polynomial
comm.RSEncoder.GeneratorPolynomialSource - Source of generator polynomial
comm.RSEncoder.GeneratorPolynomial - Generator polynomial
comm.RSEncoder.CheckGeneratorPolynomial - Option to check generator polynomial
comm.RSEncoder.PrimitivePolynomialSource - Source of primitive polynomial
comm.RSEncoder.PrimitivePolynomial - Primitive polynomial
comm.Scrambler.Polynomial      - Connections for linear feedback shift registers
zpk.DisplayFormat              - Specifies how the numerator and denominator polynomials are factorized for display
dsp.AllpassFilter.AllpassCoefficients - Allpass polynomial coefficients
dsp.CoupledAllpassFilter.AllpassCoefficients1 - Allpass polynomial coefficients of branch 1
dsp.CoupledAllpassFilter.AllpassCoefficients2 - Allpass polynomial coefficients of branch 2
dsp.FarrowRateConverter.PolynomialOrder - Order of Lagrange-interpolation-filter polynomial
dsp.FarrowRateConverter.Coefficients - Filter polynomial coefficients
dsp.IIRHalfbandDecimator.AllpassCoefficients1 - Allpass polynomial filter coefficients of first branch
dsp.IIRHalfbandDecimator.AllpassCoefficients2 - Allpass polynomial filter coefficients of second branch
dsp.IIRHalfbandInterpolator.AllpassCoefficients1 - Allpass polynomial filter coefficients of first branch
dsp.IIRHalfbandInterpolator.AllpassCoefficients2 - Allpass polynomial filter coefficients of second branch
dsp.VariableFractionalDelay.ProductPolynomialValueDataType - Data type of the product polynomial value
dsp.VariableFractionalDelay.CustomProductPolynomialValueDataType - Word and fraction lengths of product polynomial value
dsp.VariableFractionalDelay.AccumulatorPolynomialValueDataType - Data type of the accumulator polynomial value
dsp.VariableFractionalDelay.CustomAccumulatorPolynomialValueDataType - Word and fraction lengths of accumulator polynomial value
dsp.VariableFractionalDelay.MultiplicandPolynomialValueDataType - Data type of multiplicand polynomial value
dsp.VariableFractionalDelay.CustomMultiplicandPolynomialValueDataType - Word and fraction lengths of multiplicand polynomial value
arima.P                        - Compound AR polynomial degree
arima.Q                        - Compound MA polynomial degree
arima.AR                       - Nonseasonal AR polynomial coefficients
arima.SAR                      - Seasonal AR polynomial coefficients
arima.MA                       - Nonseasonal MA polynomial coefficients
arima.SMA                      - Seasonal MA polynomial coefficients
arima.Seasonality              - Degree of seasonal differencing polynomial
conjugatebvarm.P               - Multivariate autoregressive polynomial order
diffusebvarm.P                 - Multivariate autoregressive polynomial order
egarch.P                       - GARCH polynomial degree
egarch.Q                       - Maximum degree of ARCH and leverage polynomials
egarch.GARCH                   - GARCH polynomial coefficients
egarch.ARCH                    - ARCH polynomial coefficients
egarch.Leverage                - Leverage polynomial coefficients
empiricalbvarm.P               - Multivariate autoregressive polynomial order
garch.P                        - GARCH polynomial degree
garch.Q                        - ARCH polynomial degree
garch.GARCH                    - GARCH polynomial coefficients
garch.ARCH                     - ARCH polynomial coefficients
gjr.P                          - GARCH polynomial degree
gjr.Q                          - Maximum degree of ARCH and leverage polynomials
gjr.GARCH                      - GARCH polynomial coefficients
gjr.ARCH                       - ARCH polynomial coefficients
gjr.Leverage                   - Leverage polynomial coefficients
LagOp.Coefficients             - Lag operator polynomial coefficients
LagOp.Degree                   - Polynomial degree p
LagOp.Dimension                - Polynomial dimension m
LagOp.Lags                     - Polynomial lags associated with nonzero coefficients
normalbvarm.P                  - Multivariate autoregressive polynomial order
regARIMA.P                     - Compound AR polynomial degree
regARIMA.Q                     - Compound MA polynomial degree
regARIMA.AR                    - Nonseasonal AR polynomial coefficients ϕ
regARIMA.MA                    - Nonseasonal MA polynomial coefficients θ
regARIMA.SAR                   - Seasonal AR polynomial coefficients Φ
regARIMA.SMA                   - Seasonal MA polynomial coefficients
regARIMA.Seasonality           - Degree of seasonal differencing polynomial
semiconjugatebvarm.P           - Multivariate autoregressive polynomial order
varm.P                         - Multivariate autoregressive polynomial order
idpoly.A                       - Values of polynomial coefficients
idpoly.B                       - Values of polynomial coefficients
idpoly.C                       - Values of polynomial coefficients
idpoly.D                       - Values of polynomial coefficients
idpoly.F                       - Values of polynomial coefficients
idpoly.Variable                - Polynomial model display variable
idSupportVectorMachine.Polynomial Order - Polynomial kernel function order
polynomialRegressor.Variables  - Output and input variable names
polynomialRegressor.Lags       - Lags in each variable
polynomialRegressor.UseAbsolute - Absolute value indicator
polynomialRegressor.AllowVariableMix - Mixed variables indicator
polynomialRegressor.AllowLagMix - Mixed lag indicator
polynomialRegressor.TimeVariable - Name of time variable
images.geotrans.PolynomialTransformation2D.A - Polynomial coefficients used to determine U in the inverse transformation
images.geotrans.PolynomialTransformation2D.B - Polynomial coefficients used to determine V in the inverse transformation
images.geotrans.PolynomialTransformation2D.Degree - Degree of polynomial transformation
images.geotrans.PolynomialTransformation2D.Dimensionality - Dimensionality of geometric transformation
map.geotiff.RPCCoefficientTag.LineNumeratorCoefficients - Coefficients for the polynomial in the numerator of the r(n) equation
map.geotiff.RPCCoefficientTag.LineDenominatorCoefficients - Coefficients for the polynomial in the denominator of the r(n) equation
map.geotiff.RPCCoefficientTag.SampleNumeratorCoefficients - Coefficients for the polynomial in the numerator of the c(n) equation
map.geotiff.RPCCoefficientTag.SampleDenominatorCoefficients - Coefficients for the polynomial in the denominator of the c(n) equation
pde.FEMesh.GeometricOrder      - Element polynomial order
phased.NonlinearFMWaveform.PolynomialCoefficients - Coefficients of polynomial frequency function
polynomialTrajectory.SampleRate - Sample rate of trajectory (Hz)
polynomialTrajectory.SamplesPerFrame - Number of samples per output frame
polynomialTrajectory.Orientation - Orientation at each waypoint
polynomialTrajectory.Waypoints - Positions in navigation coordinate system (m)
polynomialTrajectory.TimeOfArrival - Timestamp at each waypoint (s)
polynomialTrajectory.AutoPitch - Align pitch angle with direction of motion
polynomialTrajectory.AutoBank  - Align roll angle to counteract centripetal force
polynomialTrajectory.ReferenceFrame - Reference frame of trajectory
polynomialTrajectory.Velocities - Velocity in navigation coordinate system at each waypoint (m/s)
polynomialTrajectory.Course    - Horizontal direction of travel (degrees)
polynomialTrajectory.GroundSpeed - Groundspeed at each waypoint (m/s)
polynomialTrajectory.ClimbRate - Climb rate at each waypoint (m/s)
dvbrcs2RecoveryConfig.ScramblingPolynomial - Scrambling polynomial
dvbrcs2WaveformGenerator.ScramblingPolynomial - Scrambling polynomial
polynomialTrajectory.SampleRate - Sample rate of trajectory (Hz)
polynomialTrajectory.SamplesPerFrame - Number of samples per output frame
polynomialTrajectory.Orientation - Orientation at each waypoint
polynomialTrajectory.Waypoints - Positions in navigation coordinate system (m)
polynomialTrajectory.TimeOfArrival - Timestamp at each waypoint (s)
polynomialTrajectory.AutoPitch - Align pitch angle with direction of motion
polynomialTrajectory.AutoBank  - Align roll angle to counteract centripetal force
polynomialTrajectory.ReferenceFrame - Reference frame of trajectory
polynomialTrajectory.Velocities - Velocity in navigation coordinate system at each waypoint (m/s)
polynomialTrajectory.Course    - Horizontal direction of travel (degrees)
polynomialTrajectory.GroundSpeed - Groundspeed at each waypoint (m/s)
polynomialTrajectory.ClimbRate - Climb rate at each waypoint (m/s)
fisheyeIntrinsics.MappingCoefficients - Polynomial coefficients for projection function
laurentPolynomial.Coefficients - Laurent polynomial coefficients
laurentPolynomial.MaxOrder     - Maximum order
DPD Coefficient Estimator      - Estimate memory-polynomial coefficients for digital predistortion
General CRC Generator          - Generate CRC code bits according to generator polynomial and append to input data frames
General CRC Syndrome Detector  - Detect errors in received codeword frames according to generator polynomial
Farrow Rate Converter          - Polynomial sample-rate converter with arbitrary conversion factor
Least Squares Polynomial Fit   - Compute polynomial coefficients that best fit input data in least-squares sense
Polynomial Evaluation          - Evaluate polynomial expression
Polynomial Stability Test      - Use Schur-Cohn algorithm to determine whether all roots of input polynomial are inside unit circle
Farrow Rate Converter          - Polynomial sample-rate converter
Model Type Converter           - Convert polynomial model coefficients to state-space model matrices
Recursive Polynomial Model Estimator - Estimate input-output and time-series polynomial model coefficients
Minimum Jerk Polynomial Trajectory - Generate minimum jerk polynomial trajectories through multiple waypoints
Minimum Snap Polynomial Trajectory - Generate minimum snap polynomial trajectories through multiple waypoints
Polynomial Trajectory          - Generate polynomial trajectories through waypoints
RST Controller                 - Predictive control using a polynomial representation
Minimum Jerk Polynomial Trajectory - Generate minimum jerk polynomial trajectories through multiple waypoints
Minimum Snap Polynomial Trajectory - Generate minimum snap polynomial trajectories through multiple waypoints
Nonlinear Rotational Spring    - Torsional spring based on polynomial or table lookup parameterizations
Nonlinear Translational Spring - Translational spring based on polynomial or table lookup parameterizations
PCCCS                          - Polynomial current-controlled current source
PCCCS2                         - Polynomial current-controlled current source with two controlling inputs
PCCVS                          - Polynomial current-controlled voltage source
PCCVS2                         - Polynomial current-controlled voltage source with two controlling inputs
PVCCS                          - Polynomial voltage-controlled current source
PVCCS2                         - Polynomial voltage-controlled current source with two controlling inputs
PVCVS                          - Polynomial voltage-controlled voltage source
PVCVS2                         - Polynomial voltage-controlled voltage source with two controlling inputs
laurpoly                       - (To be removed) Laurent polynomials constructor

or from local install

>> lookfor polynomial
conv                           - Convolution and polynomial multiplication for tall arrays
polyfit                        - Fit polynomial to data.
polyval                        - Evaluate polynomial.
conv                           - Convolution and polynomial multiplication.
deconv                         - Deconvolution and polynomial division.
detrend                        - Remove a polynomial trend.

>> 
>> ver
-----------------------------------------------------------------------------------------------------
MATLAB Version: 9.11.0.1873467 (R2021b) Update 3
MATLAB License Number: xxxxx
Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 19045)
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------
MATLAB                                                Version 9.11        (R2021b)
Curve Fitting Toolbox                                 Version 3.6         (R2021b)
MATLAB Compiler                                       Version 8.3         (R2021b)
Optimization Toolbox                                  Version 9.2         (R2021b)
Signal Processing Toolbox                             Version 8.7         (R2021b)
Statistics and Machine Learning Toolbox               Version 12.2        (R2021b)
>> 

[Matt J]

Incidentally also, the output of "help polyfit" in R2023b (which you have marked as the version you are using) is not as you have shown it. Running it here shows different text, as below. Perhaps you have written your own version of polyfit?

help polyfit

 POLYFIT Fit polynomial to data.
    P = POLYFIT(X,Y,N) finds the coefficients of a polynomial P(X) of
    degree N that fits the data Y best in a least-squares sense. P is a
    row vector of length N+1 containing the polynomial coefficients in
    descending powers, P(1)*X^N + P(2)*X^(N-1) +...+ P(N)*X + P(N+1).
 
    [P,S] = POLYFIT(X,Y,N) returns the polynomial coefficients P and a
    structure S for use with POLYVAL to obtain error estimates for
    predictions.  S contains these fields:
 
          R  -  Triangular R factor (possibly permuted) from a QR
                decomposition of the Vandermonde matrix of X
         df  -  Degrees of freedom
      normr  -  Norm of the residuals
 
    If the data Y are random, an estimate of the covariance matrix of P is
    (Rinv*Rinv')*normr^2/df, where Rinv is the inverse of R.
 
    [P,S,MU] = POLYFIT(X,Y,N) finds the coefficients of a polynomial in
    XHAT = (X-MU(1))/MU(2) where MU(1) = MEAN(X) and MU(2) = STD(X). This
    centering and scaling transformation improves the numerical properties
    of both the polynomial and the fitting algorithm.
 
    Warning messages result if N is >= length(X), if X has repeated, or
    nearly repeated, points, or if X might need centering and scaling.
 
    Example: simple linear regression with polyfit
 
      % Fit a polynomial p of degree 1 to the (x,y) data:
        x = 1:50;
        y = -0.3*x + 2*randn(1,50);
        p = polyfit(x,y,1);
 
      % Evaluate the fitted polynomial p and plot:
        f = polyval(p,x);
        plot(x,y,'o',x,f,'-')
        legend('data','linear fit')
 
    Class support for inputs X,Y:
       float: double, single
 
    See also POLY, POLYVAL, ROOTS, LSCOV.

    Documentation for polyfit
       doc polyfit

    Other uses of polyfit

       codistributed/polyfit    gpuArray/polyfit    tall/polyfit

[lazymatlab]

@Matt J I think I found something in my environment as you said. Reference page of polyfit in my laptop is displayed in Korean. (I am from Korea.) That's why lookfor fitting does not work. It also explains the result shown below. ("피팅" is "fitting" in Korean.)

>> lookfor 피팅
polyfit                        - Polynomial curve fitting

[lazymatlab]

@Matt J That's weird... My installation is definitely R2023b and I do not have my own polyfit.

>> ver
-----------------------------------------------------------------------------------------------------
MATLAB Version: 23.2.0.2365128 (R2023b)
MATLAB License Number: 
Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 19045)
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
-----------------------------------------------------------------------------------------------------

>> help polyfit
 polyfit - Polynomial curve fitting
    This MATLAB function returns the coefficients for a polynomial p(x) of
    degree n that is a best fit (in a least-squares sense) for the data in
    y.

    Syntax
      p = polyfit(x,y,n)
      [p,S] = polyfit(x,y,n)
      [p,S,mu] = polyfit(x,y,n)

[Steven Lord]

Let's see what polyfit.m files you have. What does this command show in your installation?

which -all polyfit

/MATLAB/toolbox/matlab/polyfun/polyfit.m
/MATLAB/toolbox/matlab/bigdata/@tall/polyfit.m              % tall method
/MATLAB/toolbox/parallel/gpu/@gpuArray/polyfit.m            % gpuArray method
/MATLAB/toolbox/parallel/parallel/@codistributed/polyfit.m  % codistributed method

You may not have the latter two if you don't have Parallel Computing Toolbox installed.

[lazymatlab]

@Steven Lord

>> which -all polyfit
C:\Program Files\MATLAB\R2023b\toolbox\matlab\polyfun\polyfit.m
C:\Program Files\MATLAB\R2023b\toolbox\parallel\gpu\@gpuArray\polyfit.m            % gpuArray method
C:\Program Files\MATLAB\R2023b\toolbox\matlab\bigdata\@tall\polyfit.m              % tall method
C:\Program Files\MATLAB\R2023b\toolbox\parallel\parallel\@codistributed\polyfit.m  % codistributed method
>> 

Answer 1

[Angelo Yeo]

Thank you for reporting this issue. I can reproduce the issue in a machine with Japanese locale. (Sorry, I don't have a Korean locale machine as of now.) Can you please reach out to Technical Support?

>> ver
---------------------------------------------------------------------------------------------------
MATLAB バージョン: 23.2.0.2365128 (R2023b)
MATLAB ライセンス番号: unknown
オペレーティング システム: Microsoft Windows 10 Enterprise Version 10.0 (Build 18363)
Java バージョン: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
---------------------------------------------------------------------------------------------------

>> lookfor curve fitting
IRFitOptions.FitType           - Minimize by in curve fitting process

>> lookfor 曲線近似 % Note that 曲線近似 means curve fitting in Japanese
polyfit                        - Polynomial curve fitting
berfit                         - Fit curve to nonsmooth empirical BER data
fittype                        - Fit type for curve and surface fitting
prepareCurveData               - Prepare data inputs for curve fitting
lsqcurvefit                    - Solve nonlinear curve-fitting (data-fitting) problems in least-squares sense
sftool                         - (Removed) Open Curve Fitting app

However "isprime" comes up with Japanese and English querying. This is strange, too.

>> lookfor 素数 % Note that 素数 menas prime
abs                            - Absolute value and complex magnitude
colperm                        - Sparse column permutation based on nonzero count
complex                        - Create complex array
cplxpair                       - Sort complex numbers into complex conjugate pairs
imag                           - Imaginary part of complex number
isprime                        - Determine which array elements are prime
isreal                         - Determine whether array uses complex storage
matlab.io.fits.readKeyCmplx    - Keyword as complex scalar value
primes                         - Prime numbers less than or equal to input value
...
    
>> lookfor prime
isprime                        - Determine which array elements are prime
primes                         - Prime numbers less than or equal to input value
...

[lazymatlab]

Thank you, @Angelo Yeo.

A few updates for this issue below:

• lookfor fitting works fine if 1) Windows display language is Korean and 2) MATLAB Help language is English (Preferences - Help - Language).
• If Windows display language is English, MATLAB Preferences do not have Language setting, both Desktop language and Help language. That's why I had to change Windows display language as Korean first.
• I have always used English as Windows display language. Thus, I think, all my MATLABs never had Language settings. I have never known that I could change Help language until today I have found it.
• But still mysterious is that my initial Help language was Korean, not English, even though OS language was English when MATLAB was being installed.