Star Strider

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Hic sunt dracones! PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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Running a large array
See the documentation section on Tall Arrays (introduced in R2016b). I have rarely needed to use them, so I have little exper...

environ 11 heures il y a | 0

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How to make bar plot with group mean and add scatter plot on top to demonstrate samples within group?
Apparently the group means are the heights of the bars. Try this — MC1 = randn(50,2)*10 + [80 81]; ...

environ 11 heures il y a | 1

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how to do a contour plot using function handle?
Provide arguments to ‘M’ and it works — T=linspace(0,2*pi,100); d = linspace(0,2*pi,100) ; [X,Y] = meshgrid(T,d);...

environ 12 heures il y a | 1

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Eliminate the long number appearing in symbolic calculations
You can conttrol the number of digits displayed by including a second argument (here 7) to your vpa call — syms J1 term = ...

3 jours il y a | 1

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Finding a a path between two points on a 3d surface that proceeds through lowest value points.
I am not certain what you wantt, and I doubt there is a way to impoose the energy constraints on the path. (The shortestpath fu...

3 jours il y a | 0

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function find() sometimes doesn't work properly
With Floating-Point Numbers you need to use a tolerance, so with find, usually one of the approaches in tthe second loop will wo...

4 jours il y a | 1

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Problem of rotation of surface on xy plane
I am not certain what you want. Yopur data do not appear to define a surface, instead they appear almost linear. An alternat...

4 jours il y a | 0

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How do I pass a dynamic number of output variables to a function?
You can define as many outputs to a function as you want. In the call to the function, you can selectt specific outputs using ...

4 jours il y a | 0

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how can solve this problem : Conversion to cell from double is not possible.
Perhaps — X = fillmissing(X(:), 'nearest'); .

5 jours il y a | 0

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Help me generate better spectrogram data using Matlab?
I am not certain what problem you’re having. What information do you want to display? There are actually two Signal Processi...

6 jours il y a | 0

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How can I plot a matrix using pcolor and colorscale as log?
According to the ColorScale documentation, that property should set the colorbar scale as well. I would not use pcolor. The...

6 jours il y a | 0

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Interpolate y and y using a 3D vector with similar length
To do the relatively simple first interpolation, use the interp2 function. Tto draw the surface plot, the best option is the ...

7 jours il y a | 0

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Genetic Algorithm with a graph
I am not certaiin what you want, however creating an options structure using optimoptions and including the name-value pair 'Plo...

8 jours il y a | 0

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Derivation of noisy signal through Savitzky-Golay
The displayed signal has high-frequency noise that (were you to calculate its Fourier transform) would be sufficiently distant f...

8 jours il y a | 0

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I enabled fft function in oscillioscope and it saved the data as FFT amplitude (dBV) and frequency domain how ever I want my time domain and ampltude signals original data.
You cannot reliably invert a Fourier transforom unless you also have the phase information. Lacking the phase information, you ...

8 jours il y a | 2

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I want to plot RMSE from mat file but it gives error
One option is to use the cellfun function (keeping ‘two’ as a cell array). The other option is to use the cell2mat function to ...

9 jours il y a | 0

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Rotating a line plot to obtain a 360-degree color map
Itt would help to have the data. It also appears that the line is not the same everywhere (it may be part of a matrix), altho...

10 jours il y a | 0

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How to manually edit located peaks using findpeaks function?
I (almost) always use the 'MinPeakProminence' name-value pair for this sort of problem. Only in the case of significant hyperka...

11 jours il y a | 0

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Match columns and fill datasets
Using the accumarray function tthis can be done in one line — File_1 = [1 1 1 1 1 ...

11 jours il y a | 0

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Difference in computational time
It appears to work correctly. What else needs to be done? (W.R.T. ‘Miscellaneous’, you can use the daspect funciton or diffe...

14 jours il y a | 0

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How to use contourf to plot a mesh not generated in matlab, i.e. imported mesh coordinates from abaqus. The issue is that coordinates are not sequential.
It would help tto have your data. Since there are (x,y,z) coordinates (there can be duplicates), I would use the scatteredInt...

15 jours il y a | 1

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Coloring area between two graphs in specific interval
It would help to have the code, or at least a file thtat I can get the information from. Lacking that, a bit of creativity ...

16 jours il y a | 0

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Problem with legend: colors don't match value of variable
I can’t run this since ‘fn’ is missing. n = 101; x = linspace(-100, 100, n); y = linspace(-100, 100, n); [X, Y] = meshgrid(...

17 jours il y a | 0

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Hello, I would like to know how to draw a shaded region like this?
Perhaps something like this — x = linspace(0, 5, 25).'; y = 5*exp(-0.5*x) + randn(size(x)); fcn = @(b,x) b(1).*exp(b(2).*x...

17 jours il y a | 0

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I want to access multiple parameters that I have defined in a function
Since the ODE integration funcitons only use the first output of the ODE functiton, one option is to add them as outputs, then w...

17 jours il y a | 0

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Locate peaks of an fft without using 'findpeaks'
In R2023a you should have the islocalmax function, that does essentially the same as findpeaks, although with slightly different...

18 jours il y a | 0

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Why such a fuss with ndgrid and meshgrid issues?
I’m not certain what the problem is. I generally prefer scatteredInterpolant to griddata. The choce of meshgrid or ndgrid ...

18 jours il y a | 1

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lsqcurvefit not working properly
It is difficult for me to understand what you are doing in this version of your code. You have a curve that is in part an exp...

18 jours il y a | 1

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Overwriting the maximum function evaluation
The options structure to lsqcurvefit must be the argument to it, since (except for name-value pair arguments), arguments to MAT...

18 jours il y a | 0

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How to use fft to analyse the refelction specturm?
It would help to have ‘xx.xlsx’, however lacking it, I will synthesize something like it — Fs = 0.1; L = 1000; t = linspace(...

19 jours il y a | 1

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