Star Strider
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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Scatter point plot into plot3d or any surface
It would help to have your data. It might not be necessary to do any interpolation if you only want to use those vectors. Ju...
2 days ago | 1
I have a code but am unable to use if conditions with matrix value
I cannot understand what you want help with. If you want to avoid using values that equal 0, one way is to use 'logical index...
4 days ago | 0
changed behavior of spectogram and/or surface in current Matlab version leading to artefacts
I do not have R2021b to work with. Your code appears to work as you want it to in R2025a. First, be certain that you have al...
4 days ago | 0
Extracting Respiratory Cycle Duration from RPM Waveform Stored in DICOM Files
Part of the problem is that your instrument is 'saturating', such that the amplitude of the signal exceeds the ability of the in...
4 days ago | 0
How to correctly find the solution of a system of equations containing trigonometric functions
It would be difficult to plot this since there are so many variables, and it is not obvious (to me, at least) what 1 or 2 variab...
7 days ago | 0
Listing values for a specific harmonic line from waterfall figure
By 'harmonic line', I assume you intend frequency, the x-axis coordinate in each plot. A waterfall plot is a specific depiction...
11 days ago | 0
Fatal error starting Matlab 1. time in Ubuntu 25.04
From the Platform Roadmap documentation, R2023a only supports Ubuntu 22.04 LTS. The 25.04 release is not listed for any MATLAB ...
11 days ago | 0
How do I use readcell and keep leading spaces within cells
There may be other ways of doing this (and I am not certain that it will work with your Excel fiile), however if you define whit...
13 days ago | 2
How do I change column headers in my table
If your immediate problem is naming the variables, perhaps -- Int_force = randn(6,6,28); Force = repmat(["Axial Force";"Shea...
14 days ago | 0
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2D acoustic wave equation with a Perfectly Matched Layer
I'm not certains what this code is supposed to do or the result it's supposed to produce. The problems were that the diff cal...
15 days ago | 0
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Cross-Coupled System Identification
I am not entirely certain that I understand what you want to do. If you have the input and output data, you have a system mod...
15 days ago | 0
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create a code for butterworth 4th order bandpass filter without Signal Processing Toolbox
A relatively straightforward presentation stats with (for a fourth-order prototype lowpass filter) -- where is a normalisin...
17 days ago | 1
Last tick labels dissapear when plotting with axes at origin (0,0)
After experimenting with this a bit, using: axis('padded') might be the best option. x = linspace(-20, 20, 50); y = tanh(...
20 days ago | 0
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How do I get bold formatted subscript mathematical expressions in MATLAB using LaTeX?
Using g_{\it\textbf{R}} works here using tthe LaTeX interpreter ( button in the top toolbar) -- The 'R' actually is sub...
20 days ago | 0
How to surfc or surf a .mat file
The error is clear -- imshow(imread('64C9C921-689D-4180-8EAD-7EE1126E5382.png')) At least one of your data are vectors (it wo...
20 days ago | 0
Dimensioning a field within a structure array for reading data
It might be worthwhile to use the readcell function to read it. After that, the cell2struct function could work to create a s...
25 days ago | 0
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Unrecognized function or variable 'fetchmulti'.
According to the documentation, fetchmulti was introduced in R2024b, and is part of the Database Toolbox. If you were using i...
27 days ago | 0
MATLAB Suddenly Stopped Being Able to Plot
First, see if the path got corrupted. Run these: restoredefaultpath rehash toolboxcache from a script or your Command W...
28 days ago | 0
How can I rectify the issue of figure not displaying curve the right way?
I am not exactly certain what the problem is (not enough information), however increasing the LineWidth could be a solution, fol...
29 days ago | 0
fill function sometimes working and sometimes not working, why?
I generally use patch rather than fill because I understand patch and I have more control over what it does. I'm not certain ...
1 month ago | 0
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Plot not showing the desired markers and does not match the legend
It is difficult for me to understand what you're doing, although I believe this is close to what you want -- % ----- Experimen...
1 month ago | 0
Whis my root locus plot showing me a blank figure?
It works here and in MATLAB Online for me -- sys = tf([2 5 1],[1 2 3]); rlocus(sys) The problem may be your browser. Try ...
1 month ago | 0
Range FFT Magnitude Too High – Help Needed to Get Proper Y-Axis Magnitude
@A -- With respect to your earlier Comment, a FIR filter is not the best choice if you need only one filter. I would suggest ...
1 month ago | 0
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Help with Plotting the Envelope of a Scatter Plot in MATLAB
The boundary function or related functions can probably help with this. Since the data appear to have stepwise y-values, anot...
1 month ago | 1
Is it possible to add a secondary y axis while using the stackedplot function?
Apparently not. Any provision for creating a second y-axis is apparently not available, even when attempting to 'force' it (t...
1 month ago | 0
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curve fitting toolbox is showing installed but when i try to use in my apps pane it display 'no apps installed'. i dont know what to do please help.
First, run these from a script or your Command Window: restoredefaultpath rehash toolboxcache If that does not solve your ...
1 month ago | 0
Difference between integral and cumtrapz.
They produce the same result if you let them. Try something like this -- x = [-10:0.01:10]'; fx = @(x) x.^2; for k = 1:nu...
1 month ago | 0
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Error "Array indices must be positive integers or logical values" occurs at the line [row1, col1, s1] = ind2sub(size(chi_coeff), idx1);
My guess is that you have a variable names 'size' and that is throwing the error. Run this to test that hypothesis: which s...
1 month ago | 2
Title issues when plotting
Create everything as a string array -- InputSheet = "Plate #1"; Grain{1} = 42 degsign = string(char(176)); n = 1; T_oQlast...
2 months ago | 0
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