Answered

How to fix error of this type: "Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue"

Hi，“z(2).z(1)” should be "z(2).*z(1)"

How to fix error of this type: "Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue"

Hi，“z(2).z(1)” should be "z(2).*z(1)"

ongeveer 5 uur ago | 0

Answered

Improving fit of custom function

Hi, what is the function you want to fit? y= A+m*x+(B+n*x)/(1+10^(-((x-C)/D))) or y= A+m*x+(B+n*x)/(1+exp(-((x-C)/D))) if th...

Improving fit of custom function

Hi, what is the function you want to fit? y= A+m*x+(B+n*x)/(1+10^(-((x-C)/D))) or y= A+m*x+(B+n*x)/(1+exp(-((x-C)/D))) if th...

ongeveer 6 uur ago | 0

Answered

continuity of a fit function in different regions

Hi, the tool I used is "1stOpt"，an Independent software （not the toolbox or command of Matlab）, the full codes have been provide...

continuity of a fit function in different regions

Hi, the tool I used is "1stOpt"，an Independent software （not the toolbox or command of Matlab）, the full codes have been provide...

ongeveer 11 uur ago | 0

Answered

continuity of a fit function in different regions

Hi, use the function above, p1 and p2 are two divided point, the solve tool is 1stOpt, code: Parameter p1=[0,1],p2=[1,2]; Fu...

continuity of a fit function in different regions

Hi, use the function above, p1 and p2 are two divided point, the solve tool is 1stOpt, code: Parameter p1=[0,1],p2=[1,2]; Fu...

1 dag ago | 0

Answered

continuity of a fit function in different regions

Attach your data file please.

continuity of a fit function in different regions

Attach your data file please.

1 dag ago | 0

Answered

Solving Multivar Non-Linear Regression from a Data Set

not Matlab, another software named "1stOpt"

Solving Multivar Non-Linear Regression from a Data Set

not Matlab, another software named "1stOpt"

1 dag ago | 0

Answered

Fit convergence to degenerated model - a reasonable expectation?

we use a software called "1stOpt"

Fit convergence to degenerated model - a reasonable expectation?

we use a software called "1stOpt"

1 dag ago | 0

Answered

Fit convergence to degenerated model - a reasonable expectation?

Hi，Dev-iL，theoretically，the SSE of f2 should be less or equal to that of f1, since f1 is the special case of f2, when b3=0. Als...

Fit convergence to degenerated model - a reasonable expectation?

Hi，Dev-iL，theoretically，the SSE of f2 should be less or equal to that of f1, since f1 is the special case of f2, when b3=0. Als...

1 dag ago | 0

Answered

How to solve 4 equations with 4 unknowns with bounds?

Refer the results below: x1: 7.73410323214524 x2: 32.0801819920043 x3: 33.4573119565274 x4: 11.2688338748665

How to solve 4 equations with 4 unknowns with bounds?

Refer the results below: x1: 7.73410323214524 x2: 32.0801819920043 x3: 33.4573119565274 x4: 11.2688338748665

8 dagen ago | 0

Answered

Solving Multivar Non-Linear Regression from a Data Set

try the function below: z = (p1+p2*x+p3*y)/(1+p4*x+p5*y)+p6; where z: moisture content; x: temperature; y:humidity Root of Me...

Solving Multivar Non-Linear Regression from a Data Set

try the function below: z = (p1+p2*x+p3*y)/(1+p4*x+p5*y)+p6; where z: moisture content; x: temperature; y:humidity Root of Me...

17 dagen ago | 0

Answered

Fit convergence to degenerated model - a reasonable expectation?

Hi, I think you may make wrong calculation: with function of "f1(T) = A/( exp(B1/T + B2/T^2 ) + C )", the result is: R...

Fit convergence to degenerated model - a reasonable expectation?

Hi, I think you may make wrong calculation: with function of "f1(T) = A/( exp(B1/T + B2/T^2 ) + C )", the result is: R...

17 dagen ago | 0

Answered

solve a system of equations

There are multi-solutions: 1: x: -4.93419751895286 y: -16.1073500969731 r: 327.876127534353 2: x: -3.55619697118012 y: -8...

solve a system of equations

There are multi-solutions: 1: x: -4.93419751895286 y: -16.1073500969731 r: 327.876127534353 2: x: -3.55619697118012 y: -8...

19 dagen ago | 0

Answered

fmincon with nonlinear equality constraints

Please try a software called "1stOpt": Codes: MinFunction x1+x2+x3+x4+x5+x6+x7; (1-x1)*(1-x2)=0; (1-x1)*(1-x2)*(1-x3)*(1-x6)...

fmincon with nonlinear equality constraints

Please try a software called "1stOpt": Codes: MinFunction x1+x2+x3+x4+x5+x6+x7; (1-x1)*(1-x2)=0; (1-x1)*(1-x2)*(1-x3)*(1-x6)...

19 dagen ago | 0

Answered

How can i linearise this equation in matlab? y=a*x*e^b*x

by linearization, the results are： a: 9.66178585962543 b: -2.47330876570272 While if using nonlinear regression fitting direc...

How can i linearise this equation in matlab? y=a*x*e^b*x

by linearization, the results are： a: 9.66178585962543 b: -2.47330876570272 While if using nonlinear regression fitting direc...

24 dagen ago | 0

Answered

How to use multistart with 'fit' function

Multi-solutions (Parameter a is different): 1: Root of Mean Square Error (RMSE): 0.109662308225183 Sum of Squared Residual: 0...

How to use multistart with 'fit' function

Multi-solutions (Parameter a is different): 1: Root of Mean Square Error (RMSE): 0.109662308225183 Sum of Squared Residual: 0...

25 dagen ago | 0

Answered

How to fit data to a Weibull bi-modal function ? nlinfit? lsqcurvefit?

please refer the results below: c1 6.93726775107201 c2 2.61789361078231 c3 5.06299442732144 c4 4.41925787462909 or: c1 5.0...

How to fit data to a Weibull bi-modal function ? nlinfit? lsqcurvefit?

please refer the results below: c1 6.93726775107201 c2 2.61789361078231 c3 5.06299442732144 c4 4.41925787462909 or: c1 5.0...

26 dagen ago | 0

Answered

Fitting multiple Datasets with shared and individual Parameters.

Hi, Fabian Bienen, if possible please upload your data here, I may try to solve it.

Fitting multiple Datasets with shared and individual Parameters.

Hi, Fabian Bienen, if possible please upload your data here, I may try to solve it.

26 dagen ago | 0

Answered

Line search algorithm: nonlinear least squares method for fitting experimental data to a model

Please upload your data，I may try.

Line search algorithm: nonlinear least squares method for fitting experimental data to a model

Please upload your data，I may try.

26 dagen ago | 1

Answered

fitting a parabola giving unreasonable answer

Note the part "b.*6.022e23" in the fitting function y = a.*exp(((-4.*pi.*b.*6.022e23)./(8.314.*1623)).*(((c./2.*(c-x).^2) - (1/3...

fitting a parabola giving unreasonable answer

Note the part "b.*6.022e23" in the fitting function y = a.*exp(((-4.*pi.*b.*6.022e23)./(8.314.*1623)).*(((c./2.*(c-x).^2) - (1/3...

26 dagen ago | 0

Answered

fsolve message "Equation solved, inaccuracy possible"

if x should be positive， then the solution 1 should be answer. I use another software "1stOpt", the code is very simple as below...

fsolve message "Equation solved, inaccuracy possible"

if x should be positive， then the solution 1 should be answer. I use another software "1stOpt", the code is very simple as below...

26 dagen ago | 1

Answered

Non Linear Fit help?

For the fitting function: F = (((K.*(Vg-V).^(b+1)).^(-1))+R).^(-1); Obviously，should be: V < min(Vg) = 0, the reuslt may be: ...

Non Linear Fit help?

For the fitting function: F = (((K.*(Vg-V).^(b+1)).^(-1))+R).^(-1); Obviously，should be: V < min(Vg) = 0, the reuslt may be: ...

28 dagen ago | 0

Answered

Parameter estimation using fminsearch and ode45

The "true" Global Optimization Algorithm does not need to guess initial start values of parameters, unfortunately, most of curre...

Parameter estimation using fminsearch and ode45

The "true" Global Optimization Algorithm does not need to guess initial start values of parameters, unfortunately, most of curre...

28 dagen ago | 0

Answered

fsolve message "Equation solved, inaccuracy possible"

Multi-solutions: 1: x1: 1.00788811123075E-6 x2: 0.0083586258586415 x3: 0.0330975342164431 x4: 0.000243072462467804 x5: 4.2...

fsolve message "Equation solved, inaccuracy possible"

Multi-solutions: 1: x1: 1.00788811123075E-6 x2: 0.0083586258586415 x3: 0.0330975342164431 x4: 0.000243072462467804 x5: 4.2...

ongeveer een maand ago | 0

Answered

Large system of equations, vpaSolve returning empty sym

one approximate solution calculated by another software called "1stOpt": aliq: 2.78633151012791E-7 bliq: 25.4564536830427 ava...

Large system of equations, vpaSolve returning empty sym

one approximate solution calculated by another software called "1stOpt": aliq: 2.78633151012791E-7 bliq: 25.4564536830427 ava...

ongeveer een maand ago | 0

Answered

problem solving nonlinear equation system with fsolve

here are solutions: x1: 1.80929329243556 x2: 1.67586180846898 x3: 1.19942316545143

problem solving nonlinear equation system with fsolve

here are solutions: x1: 1.80929329243556 x2: 1.67586180846898 x3: 1.19942316545143

ongeveer een maand ago | 0

Answered

Non linear system of equations

multi-solutions: 1: x1 0.00357502545408908 x2 1.88403841412371 x3 3.32997281546349E-5 x4 2.49981876993596E-6 x5 2.40013395...

Non linear system of equations

multi-solutions: 1: x1 0.00357502545408908 x2 1.88403841412371 x3 3.32997281546349E-5 x4 2.49981876993596E-6 x5 2.40013395...

ongeveer een maand ago | 1

Answered

Fsolve Error! Need help- Using Fsolve to solve system of non-linear equations.

Hi， your equations seems to be Contradictory: "nc*(t1-t2)-(t1-x5)" lead to x5=381.7598 while "x5-(2.5^(.28571429)*t1)" lead t...

Fsolve Error! Need help- Using Fsolve to solve system of non-linear equations.

Hi， your equations seems to be Contradictory: "nc*(t1-t2)-(t1-x5)" lead to x5=381.7598 while "x5-(2.5^(.28571429)*t1)" lead t...

ongeveer een maand ago | 0

Answered

How to solve a non-linear equation system as function handle with fsolve?

Multi-results: 1: q1: 2.96669036114669 q2: 1.70487333682449 q3: 15.5136953998108 q4: 5.27144773940526 q5: 0.14218964199662...

How to solve a non-linear equation system as function handle with fsolve?

Multi-results: 1: q1: 2.96669036114669 q2: 1.70487333682449 q3: 15.5136953998108 q4: 5.27144773940526 q5: 0.14218964199662...

ongeveer een maand ago | 0