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In the case of a previously filtered signal, what methods can be employed to identify its filter characteristics?
If you have the original signal as well (before filtering), you can approximate the filter transfer function by taking the Fouri...

2 years ago | 1

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Answered
Finding the slope after drawing a trend/linear fit
Alternatively — files = dir('*.xlsx'); T1 = readtable(files.name) VN = T1.Properties.VariableNames; T = T1.T; x = T1.x; ...

2 years ago | 0

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How can I align deterministic signals?
Probably the easiest way to do this (with these signals) is simply to threshold the beginning of each to get the index, then use...

2 years ago | 1

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Answered
solve by the matrix method
Solving it symbolically — syms x1 x2 x3 x4 Eqns = [x1+2*x2-x3+x4==28 2*x1+4*x2-3*x3+x4==55 -4*x1+8*x2-12...

2 years ago | 0

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if loop for checking package weights and to calculate shipping costs
Try this — for package = [1 25 50 75 110] package % Package Weight In Loop (D...

2 years ago | 1

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How can I display axis ticks when using fill syntax?
The easiest way is to bring the ticks to the top layer — x = linspace(0, 1).'; y = x; figure fill([x; flip(x)], [zeros(si...

2 years ago | 1

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Answered
Calculate median values of slices of array associated with histogram bins
I would use another accumarray call: binmedians = accumarray(idx+1, (1:numel(idx)).', [], @(x)median(array2(x))) Creating d...

2 years ago | 0

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Answered
How can I add a horizontal dashed line with a text description above it to a specific coordinate?
Perhaps this — t = linspace(0, 5); k = 0.75; y = 5*(1-exp(-k*t)); yval = 3; tval = interp1(y, t, yval); figure plot(...

2 years ago | 0

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Answered
remove DC component of real time signal
The D-C component is the mean of the signal, so for a recorded signal, simply subtract the mean. Otherwise, since the D-C off...

2 years ago | 0

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Error: using fmincon and integral: Failure in initial objective function evaluation. FMINCON cannot continue
The ‘rhog’ variable must be defined in your workspace prior to using it as a function argument in ‘q’. EDIT — (14 Nov 202...

2 years ago | 1

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Answered
Factor P(x) with a degree of 4
One way to find out — syms x P = 5*x^4+3*x^3-6*x^2+x-4 x = vpa(solve(P)) x_real = x(imag(x)==0) x = vpa(root(P)) x_rea...

2 years ago | 0

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How to Plot Inverse Laplace with Heaviside?
Use the fplot function — clc syms s t Q = 10/(s*(s^2+100*s+1600))-10*exp(-3*s)/(s*(s^2+100*s+1600)); pretty(Q) q = ila...

2 years ago | 0

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Answered
Given an audio file, how can I construct a histogram of all bipolar pulses?
The findpeaks function can easily detect negative peaks. Simply negate the original signal to get them — t = linspace(0, 50...

2 years ago | 2

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Answered
how to calculate integral for combination of columns
One approach — T1 = readtable('ET1.xlsx', 'VariableNamingRule','preserve') [G,ID1,ID2,ID3,ID4] = findgroups(T1(:,1), T1(:,2...

2 years ago | 0

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Answered
How to plot a surface with lat, lon and depth?
You will need to create a matrix from your data vectors. (It would help to have the actual data.) Assuming they are similar ...

2 years ago | 0

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Add Text Tile to Tiled Layout
One approach — x = 0:99; y = randn(3,100); figure tiledlayout(2,2) for k = 1:3 nexttile plot(x, y(k,:)) g...

2 years ago | 0

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Answered
How can I use histfit function?
Your data are frequency data (probably the result of performing a histogram on an original data set), not actual histogram data....

2 years ago | 0

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How to interpret the frequencies on a symmteric FFT plot.
You need to use the fftshift function to put the zero frequency (D-C or constant offset) value in the centre. Then, depending o...

2 years ago | 0

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Answered
How to find the coordinates of contours when they go out of bounds and form multiple contours?
Here is my approach to this — load('contours.mat') pk = -32; [c2] = contourf(x2,y2,z35b, [pk pk] ,'ShowText','on',FaceAlpha...

2 years ago | 0

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Answered
How to combine columns from large dataset to datetime with correct vector or doublestring?
Use curly brackets {} instead of parentheses when referring to numbered table variables — Date=datetime(dataTable{:,3:5})+hour...

2 years ago | 0

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Answered
How can I selectively multiplying the negative values with (-1) in an excel file?
Multiplying the negative values of column 2 by -1 will of course create them as positive values for all the entries. Use the ...

2 years ago | 1

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How to estimate Y using a linear regression and an uncertain X value.
If I understand corectly what yoiu want to do, the best approach might be to use fitlm and then use the appropriate predict func...

2 years ago | 0

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Answered
Why does expm command work too slow?
If you want to multiply it by scalar or vector ‘t’, create an anonymous function rather than doing it symbolically — A_aug = r...

2 years ago | 1

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How to draw a semi circle filled with jet color (like in the image) ?
Try this — N = 250; th1 = linspace(pi, 3*pi/2, N); r = linspace(0, 1, N); z = r; x1 = r(:)*cos(th1); y1 = r(:)*sin(th1)...

2 years ago | 0

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Time-dependent parameter in ODE solver
The interp1 use in the documentation section for time-dependent parameters refers to vector arguments with a dependent variable ...

2 years ago | 0

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Answered
Connecting different sets of 3D points
I assume the rows are the (x,y,z) coordinates, If so, try this — A_3Dpts= [-0.91, 0.53, 0.32; -.88, .51, .3; -.84, .43, .16...

2 years ago | 1

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Answered
How do I perform several iterations in MATLAB?
Since ‘y’ appears to be a column vector, the loop is not necessary. Just use: L = 1.56*(y.^2)*tanh(61.58/L); If you are loo...

2 years ago | 0

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Answered
How do i find x from given y that is closest to my peak or at x=0?
One approach — x = linspace(-10,10,500); y = 1 - x.^2; L = numel(x); yval = -6; zxi = find(diff(sign(y -yval))); for ...

2 years ago | 0

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Answered
Symbolic function Gaussian Beam
You need to use element-wise operations. See the documentation on Array vs. Matrix Operations for details. Also, you can use...

2 years ago | 0

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Using repelem to vertially concatonate non-numeric variable
I am not certain what you want to do, however the repmat function might be a better choice, since it allows the dimensions to be...

2 years ago | 1

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