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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Turn tables in a loop into a single cell array
Perhaps something like this — for k = 1:numel(OPALData) F = fullfile(OPALData(k).folder,OPALData(k).name); % I...

11 hours ago | 0

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Indexing in a loop using fileparts
One option is to use the extractBetween funciton — filename.name(1) = "X000_104520.txt"; filename.name(2) = "X001_122004.txt"...

18 hours ago | 1

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fprintf not printing to command window when asking for input.
When I run your input line, it prints this to my Command Window: Enter the number of the song you wish to play --> and then...

19 hours ago | 0

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How do I manually set color of individual datapoints of figure ?
One option is to specify a colormap and then index into it — cm = turbo(5); Fs = 1000; t = linspace(0, 301, 302).'/Fs; E = ...

19 hours ago | 0

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Finding peaks in a very noisy signal
Your signals have broadband noiise, so a frequency-selective filter is not going to apply here. The Savitzky-Golay filter (or w...

21 hours ago | 0

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Loop for reading and extracting data from a single line of multiple text files.
I generally do something like this — files = dir('*.txt'); for k = 1:numel(files) txt = fileread(files(k).name); ...

1 day ago | 0

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Monthly to annual totals
This is straightforward with the accumarray function — Y = 1960:1999; M = 1:12; Data = [[repmat(M(:), numel(Y), 1) repelem(Y(...

3 days ago | 0

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Trouble Plotting Basic Function
It appears to be coded correctly. How is it supposed to appear? X = -4:0.01:10; Y = X.^3 - (sin(X)) - (exp(X)); figure...

5 days ago | 0

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How to search and find array in array?
The ismember function is doing exactly what it should. You need to examine ‘bigArray’ tto understand its output. Try this — ...

6 days ago | 0

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Update the number of columns needed for my times table
It would heelp to have your .csv file and a description of what you want to do. Also, it might be easiier to do this in a table...

6 days ago | 0

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Segregating an EMG signal based on activation
It would help to ahve the data. Lacking it, I’ll create some. I generally approach ensemble problems such as yours like this...

7 days ago | 0

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Phase Plots Dropping when quadrant changes
Use either the angle function or atan2d for this. The angle function returns the angle of a complex variable in radians, so you...

7 days ago | 0

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How to remove border from MATLAB figure
It might be easier to do that when you first create the spectrogram. Try something like this — Fs = 1000; L = 10; t = li...

8 days ago | 0

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Function file does not work
In R2024a, you can put the function anywhere in your code (although except for anonymous functions, I usually still put all of t...

8 days ago | 0

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How to plot a 3D contour plot when the contours is a forth vector
Use the contour3 function. If ‘A’ is a list of the contour levels, all the MATLAB contour functions accommodate defining the c...

9 days ago | 0

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Customizing plots that are matrices of column vectors?
It is reelatively straightforward to change the markers (and other propeerties) after plotting. Try something like this — ...

9 days ago | 0

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Plot 3D Meshgrid
See thee documentation sections in Volume Visualization.

9 days ago | 0

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Best fit line for scatter data along y=x line
What sort of regression would you want for the volume in the second figure? LD1= load('uu.mat'); uu = LD1.uu; uu_size = siz...

10 days ago | 0

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Filtering white noise signal from acceleration data
The best way to deal with broadband noise is either to use wavelet denoiising or the Savitzky-Golay filter (the sgolayfilt funct...

12 days ago | 0

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How to Remove Noise from Plot of Velocity Profile?
It is difficult to determine from the image what the ‘noise’ actually is. If it is significantly higher or lower in frequency c...

12 days ago | 0

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QRS area calculation from ECG
II have heard of the Kors transformation matrix, however I have never used it. I just now did an Interweb search, and I was not...

13 days ago | 0

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first time use Histogram, need help
The histogram has already been created. Use the bar function to plot it — x = reshape([0.29:0.01:0.4], 2, []); y = [30 75 ...

13 days ago | 0

Answered
How to stop unwanted rows being added when constructing a matrix in a for loop
The reason is that there are the same number of ‘6’ and ‘-4’ being created in the loop. There needs to be one less ‘-4’. cle...

13 days ago | 0

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Slice of a 3D plot and projection of that function in a plane.
II’m not certain what result you want. Try this — x = linspace(-2,2,100); y = linspace(0,2,100); [X,Y] = meshgrid(x,y); R...

13 days ago | 2

Answered
error using reshape , number of elements must not change
An alternative could be to use the buffer function. For example — t_OCDMSymbol = buffer(t_ModemSymbol, num_Symbol); It wil...

13 days ago | 0

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curve fitter, the coefficients are hidden as 0.0000
It may not be possible to change the display format in the app. A better option would be to use fit and, iif necessary, set t...

13 days ago | 0

Answered
Problems with integration using functions
With this slight change: expecX_xbasis = integral(@(x)psitimesX(x),-inf, inf,'ArrayValued',true) I was able to get it to work...

13 days ago | 0

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unable to read GR-401 gps data with gpsdev or gpsReceiver
I did an Interweb search, however I was not able to finid anything specific about your Navisys GR-401 and MATLAB, so apparently ...

13 days ago | 0

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I need help with fixing my filtering for EMG signals
You are filtering your signals twice — once wiith the movmean call and once with thte butter call. It would likely be best to f...

14 days ago | 1

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Odd behavior using datetime
If there are more than one value that you want to convert, perhaps something like this — date = [4072016 12072016]; sdate = c...

14 days ago | 0

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