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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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Answered
Why do I get conj(L)
The Symbolic Math Toolbox assumes all variables are complex, so it adds the conj to be complete. Specifying that the variables ...

11 hours ago | 0

Answered
how to plot a certain level in a contour?
Extracting the contours for a specific level is straightforward. Try this — [x,y,c] = peaks(20); cilevels = [0.0,.005,0.01...

15 hours ago | 0

Answered
How do you return computational time and memory allocated during function call?
There are a few functions you can use for timing, one of which is the tic, toc pair. Most current recommendations are to use du...

1 day ago | 1

Answered
I am trying to use plotyy to specify the axes on a graph but I am struggling to figure out how to use it
Your data are difficult to work with. I finally gave up on creating a table, and just went with readcell to import them. Try...

1 day ago | 0

Answered
how to plot (0 1) matrix on figure
I am not certain what you intend by ‘dot plot’, however the spy function exists to do just that, if you only want to depict the ...

2 days ago | 0

| accepted

Answered
Programmatically find fzero of two RCL functions
It seems that the curves don’t intersect. The ‘funcVR’ function never crosses zero, although the ‘funcVL’ function does — f...

3 days ago | 0

| accepted

Answered
Finding x and y values of minimum z in 2-variable function.
Is there a particular reason to use that sort of iteration? MATLAB has a number of optimization funcitons you can use, with fmi...

3 days ago | 0

Answered
way to legend a data organized into colours in simple plot?
I am not certain what you want. One option — first_data = [[3 4 8 1];[3 6 4 9]]; % desired legend (first) & color (green) ...

4 days ago | 1

| accepted

Answered
I'm trying to plot a graph with if than statements but keep getting the error "Array indices must be positive integers or logical values."
The definition of ‘positive integer’ are integers greater than zero. So use: for i=(1:n) instead of: for i=(0:n) There...

4 days ago | 0

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Answered
period segmentation of wrist pulse signal
See: Combining repetitive curves into one average curve for an example. This demonstrates how to segment them and also how to c...

6 days ago | 0

Answered
I am receiving an Error using plot
Use the matlabFunction function, evaluate it with ‘t’ and then plot — m1 = 49/1000; m2 = 31/1000; l1 = 0.5; l2 = 0.5; M = ...

6 days ago | 0

| accepted

Answered
How to create a sound like this?
Firstt, look to see what their spectrograms reveal — uz = unzip('examples.zip') for k = 1:numel(uz) fn = strrep(string...

7 days ago | 0

Answered
graph the function using ezplot() and plot()
Perhaps this — syms x y % 2y^2 = -3x^3+5x , -2.5≤x≤2.5. Eqn = 2*y^2 == -3*x^3+5*x % Add O...

8 days ago | 0

Answered
Using Fill between two curves semilog plot
If you are using flipud, you will need to vertically concatenate the vectors (that are presumably column vectors), so instead of...

8 days ago | 0

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Answered
Filtering a Single Column of One Table Based on Multiple Criteria from Another Table.
I’m not sure that I fully understand your problem, however the join function (or one of its friends innerjoin or outerjoin) may ...

10 days ago | 0

Answered
Too many input arguments
Plotting over ranges of ‘t’ and ‘u’ defines a surface, so create vectors for both of them, and use either ndgrid or meshgrid (th...

10 days ago | 0

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Answered
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...

11 days ago | 0

| accepted

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

11 days ago | 0

Answered
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...

11 days ago | 0

| accepted

Answered
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...

12 days ago | 0

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Answered
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...

12 days ago | 0

Answered
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. ...

13 days ago | 0

Answered
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...

13 days ago | 0

Answered
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...

13 days ago | 0

Answered
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...

13 days ago | 0

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Answered
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...

13 days ago | 0

Answered
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 =...

13 days ago | 0

Answered
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...

14 days ago | 1

Answered
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...

14 days ago | 0

Answered
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...

14 days ago | 0

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