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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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 ...

alrededor de 16 horas hace | 0

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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...

alrededor de 20 horas hace | 0

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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...

2 días hace | 1

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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...

2 días hace | 0

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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 días hace | 0

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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 días hace | 0

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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 días hace | 0

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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 días hace | 1

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Respondida
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...

5 días hace | 0

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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 días hace | 0

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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 días hace | 0

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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...

8 días hace | 0

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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 días hace | 0

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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...

9 días hace | 0

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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 días hace | 0

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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 días hace | 0

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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...

11 días hace | 0

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Respondida
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 días hace | 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...

11 días hace | 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...

12 días hace | 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...

12 días hace | 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. ...

13 días hace | 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...

13 días hace | 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...

13 días hace | 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...

13 días hace | 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...

13 días hace | 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 =...

14 días hace | 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...

14 días hace | 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...

14 días hace | 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...

14 días hace | 0

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