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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Edit window does not open in Ubuntu 24.04.2
There seem to be problems with the latest updates to 24.04 with respect to MATLAB. Yours is the third post I have seen on 24.04...

ungefär 6 timmar ago | 0

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How to compute the characteristic equation given the eigenvalues?
The poly function can do that. Try this — A = randn(5) % Create Matrix e = ei...

ungefär 7 timmar ago | 0

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Suitable function(s) to be used for plotting the graph
Instead of using: plot(t,zz,'o-'), grid use: fplot(zz, [min(t) max(t)],'o-'), grid since ‘zz’ is a symbolic expression and...

ungefär 10 timmar ago | 0

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Iam getting the following ERRO: Array indices must be positive integers or logical values on the following code.
You need to create the ‘q’ functions as Anonymous Functions and then call them as functions of ‘t’ in the plot calls. Try thi...

en dag ago | 0

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IFFT of frequency dataset
‘(not starting at 0)’ That’s probably the problem. Essentially your data are then a sort of rectangular-window-bandpass-fil...

en dag ago | 0

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Plotting around zero deg. Angle
Aside from not having any image to work with, I am not certain what you want. First use plot to see what the problem may be. ...

2 dagar ago | 0

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MATLAB R2023b gui in ubuntu 24 is not opening files after launch. Displaying some errors and shutdown
According to MATLAB and Simulink Requirements 24.04 is supported. It would be best for you to Contact Support for installatio...

2 dagar ago | 0

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Problems at start in ubuntu 24.04.2
According to MATLAB and Simulink Requirements 24.04 is supported. It would be best for you to Contact Support for installatio...

2 dagar ago | 0

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xlabel and ylabel errors
This is instructive: when I run it brings the following error Index exceeds the number of array elements. Index must not ex...

2 dagar ago | 0

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Sending Multiple Data to Excel from MATLAB?
If you have R2013b or later, collect the data you want in a table, configure the table the way you want it, and then use the wri...

2 dagar ago | 0

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How to code an equation with that integrates a vector.
Siince ‘u’ is also a vector — u = @(t) [sinh(t); cosh(t); tanh(t)] int_u = integral(u, 0, 1, ArrayValued=true) A = rand B =...

3 dagar ago | 0

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update guess in fsolve
I am not certain what you are actually asking. If possible (if an equation can be plotted), I usually begin by plotting iit t...

3 dagar ago | 1

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Feeding a variable in a set of ODEs from an external nested for loop
It is difficult for me to follow what you are doing. I would create the ‘q_T_values’ and ‘q_b_values’ calculation as a separa...

3 dagar ago | 0

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I can't run wavedec2() - 'unrecognized function or variable'
You may be having path probleems. Run these: restoredefaultpath rehash toolboxcache from a script or your Command Windo...

3 dagar ago | 0

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time series fitting to statistical moments
‘where a and sigma are unknown parameters’ Beyond that, I am clueless as to any appropriate way to do this parameter estimation...

5 dagar ago | 0

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Distinguish the different curves and identify the points corresponding to each way
Another approach, using the stackedplot (introduced in R2018b) function — T1 = array2table(10*(rand(100,5)+(4:-1:0)), Variable...

5 dagar ago | 1

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Why i get error message when trying using lowpass?
Since it seems to be installed, you may be having path problems. Run these from a script or your Command Window: restoredef...

6 dagar ago | 0

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Can I set a datetime locale for readtable in a script?
Note that "dd/MM/yyyy :hh:mm:ss" uses 12-hour format (using hh for the hours) without the AM/PM indicator. To use 24-hour forma...

7 dagar ago | 0

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Image Processing Toolbox not found despite being installed
Run these from a script or your Command Wiindow: restoredefaultpath rehash toolboxcache If that still does not solve tthe p...

7 dagar ago | 0

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3d lines plot
Peerhaps something like this — t = linspace(0, 1).'; x = sin(2*pi*t); y = cos(2*pi*t); z = x+y; figure plot3(x, y, z) ...

7 dagar ago | 0

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Potential flow past an airfoil
Check the File Exchange. When I did and searched on ‘airfoil’, I found: Plot Pressure Distribution (Cp) Over an Airfoil / Aer...

8 dagar ago | 0

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Forcing robustfit to return an intercept
Note that ‘Y’ is single precision. MATLAB defaults to the lowest precision, so casting it as double produces a non-zero interce...

8 dagar ago | 0

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How can I extract specific weather data from a 3D grid?
Without even representative data, I’m not certain even how to simulate this. I would use the scatteredInterpolant function fi...

9 dagar ago | 1

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ODE time vector plot does not correspond to the time vector values
We don’t have your ‘ode_arm’ function, however it may be that ode23 is encountering a singularity () at about 0.9 time units, an...

9 dagar ago | 0

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Alternative to ginput for finding curve intersections with unevenly spaced data in MATLAB
Another approach — x = [linspace(0, 2.4) linspace(5.2, 7, 8)].'*1E-3; y1 = [x(x<=2.4E-3)*580/2.4E-3; 500*ones(size(x(x>2.5E...

11 dagar ago | 1

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Plot: Dots won't go higher than y=0
If you add: set(gca, 'YScale','log', 'YLim',[10 1E+8]) you will see that the green dots plot appropriately. The y-axis limit...

12 dagar ago | 0

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Extracting number after a string in header of CSV file
One approach — C1 = readcell('DummyData.txt') str = {'Memory Length','Horizontal Scale','Sampling Period'}'; idx = cellfun(@...

12 dagar ago | 0

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Plot the function on graph
Consiider fplot. I have n o idea what ‘forina’ refers to, however the rest is straightforward — b = 2; y = @(x) sqrt(9*x +...

13 dagar ago | 0

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Load data into the "System Identification Toolbox"
Since you have time-domain data, use the iddata function to prepare it for the identification function of your choice. (I prefe...

13 dagar ago | 0

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Extracting Zoomed in part of curve and finding rising Edges of data
Depending on the result you want, it might be easier to use islocalmax for this — T1 = readtable('DS0007_REDUCED.CSV') t = ...

15 dagar ago | 0

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