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Sine curve fitting in MATLAB
@M — I was in the process of answering this when Win 11 crashed. Again. For the fifth time in two days, and three times when I...

3 years ago | 0

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why am I getting the error "Incorrect number or types of inputs or outputs for function 'solve'."
For equality inside a symbolic expression, use double equal signs (==) — syms d e s=solve(7*d + 3*e == 71,d + 2*e == 20); s...

3 years ago | 0

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Answered
Plot complex signal with imaginary and complex
This is relatively straightforward — Fs = 1000; Tlen = 10; t = linspace(0, Tlen*Fs, Tlen*Fs+1)/Fs; s = exp(1j*t*2*pi); R...

3 years ago | 0

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Answered
Plotting 3D by rotate 2D plot around y-axis
Probably the easiest way is to define a cylinder and a shape vector — yv = [linspace(0.3, 1, 50)]; ys1 = yv.*exp(-1.75*yv)*5;...

3 years ago | 2

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Answered
Unable to find symbolic solution
The system is nonlinear, so it quite likely does not have an analytic solutioon. Try something like this— syms y(x) x Y D...

3 years ago | 0

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Using histcounts to determine loose data mode
I am not certain what you want to do. The histcounts function has a third output bin that will index into the elements that w...

3 years ago | 0

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Find kinetic constants from differential equations
Some examples: Monod kinetics and curve fitting , Parameter Estimation for a System of Differential Equations , and there are s...

3 years ago | 0

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How do you indicate the order of plotted points in a polar plot?
Unforutnately, quiiver and polaraxes don’t work together. The only alternative is to create your own polar axes as Cartessian a...

3 years ago | 0

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Answered
How to calculate respiratory rate from a Doppler radar signal
Perhaps something like this — LD = load(websave('radar_signal','https://www.mathworks.com/matlabcentral/answers/uploaded_files...

3 years ago | 0

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Answered
Where to find changes in functions in Matlab versions?
See: Release Notes, however that only goes back as far as R2018a. I am not certain that other documentation exists online, alth...

3 years ago | 0

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calculate the maximum of every 24 data in matrices
If the times are in (or can be converted to) datetime arrays, one option would be to transpose the matrix so that the sensors ar...

3 years ago | 0

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How do I fill legend on double y axis plot?
Without seeing your code (and your MATLAB version, although I’m not certain how relevant that is in this instance), it’s not pos...

3 years ago | 0

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How to improve speed of interp1 in for loop?
I’m not certain that I follow what you’re doing. However if you know the ‘inputValue’ and you want to find the closest indices ...

3 years ago | 0

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plot function legend is wrong.
The legend is probably picking up the first line plotted, that by default is blue. Perhaps this — figure (55) for i = ...

3 years ago | 0

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Upgrading R2021b to R2023a, Need Instructions
There is no actual ‘upgrade’ involved. Simply download R2023a (choose to create the desktop icon if that is available with your...

3 years ago | 0

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How to remove the horizontal line from my NMEA plot ?
With no file or other information, the problem may be that there is a common value (possibly 0) that separates segments of the f...

3 years ago | 0

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i have a syntax error in this expression : Vs+K*(C/(C-(u(1)*u(2)))*u(1))+R*u(1)-A*exp((-B/C)*u(1)*u(2))
Checking it with the Symbolic Math Toolbox, it appears to be correct. The only suggestion I can offer is to use element-wise op...

3 years ago | 0

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The numbers do not appear in standard format despite the writing (format shortG)
One option is to use string arrays — format shortG Mf=6.480554950317725e+03; Cp_sea=3.976; t_out=100; t_in=25; Qu=Mf*Cp_s...

3 years ago | 0

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What does this means?
It returns the elements in from rows 1 and 3 in columns 1 and 2 — G= [ 1 2 3; 4 5 6; 7 8 9]; H= G([1 3], [1 2]) .

3 years ago | 0

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Answered
ytickformat('percentage') not working with latex interpreter
This: ytickformat('$%g \\%%$') seems to work — figure(1) plot(1:100) ytickformat('percentage') figure(2) % This is th...

3 years ago | 0

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Answered
Periodogram of my audio file gives magnitudes only below zero
That you can hear it simply means that the sound card is scaling it and amplifying it. (I have no idea what the actual amplitud...

3 years ago | 1

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Transform matrices to XYZ
Something like this should work — [Lat,Lon] = ndgrid(lat,lon); LatLonDepth = [Lat(:) Lon(:), depth(:)]; Since I do not know ...

3 years ago | 0

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How can I open an Oxfor Instrument Pulsar .fid file in MATLAB?
Use zip or a non-MATLAB version of it to create a zip file that encloses the file you want to read, then upload it here. I hav...

3 years ago | 0

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Separate time series data in Individual Months
It’s not necessary to determine the beginning and dne of each month to separate them. This approach uses the ymd function wit...

3 years ago | 0

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Plotting X,Y,Z Data
With a bit of help from accumarray, it is possible to separate the traces so that there are no connecting lines — Matrix = rea...

3 years ago | 2

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How to merge plots from different scripts
I do not see the attachment. However the easiest way mightr be to save the data from each script to .mat files, and then load...

3 years ago | 0

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Is it possible to calculate variating signal frequency?
Theere are likely several ways to analyse this. One option is to use findpeaks to get the distances between peaks. Another i...

3 years ago | 0

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When using xline, would it be possible to have the text in one color and the lines in another color?
Doing that in one pass is likely not an option, since there is no way to independently control the text colour. However colouri...

3 years ago | 1

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Answered
How to add different texts in xline, when using arrayfun ?
Perhaps something like this — fig = figure(); ax = axes(fig); ax.XTick = 1:14; dy = ["S","S","M","T","W","T","F"]; hxl = ...

3 years ago | 1

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Answered
Plot shows markers, but no lines, no matter what is being plotted
The code is also being run in R2023a, since that just released. If you are using the pre-release version, consider downloading ...

3 years ago | 0