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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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...

9 hours ago | 0

Answered
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...

20 hours 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...

22 hours 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...

1 day 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...

2 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 — ...

2 days ago | 0

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

2 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...

4 days ago | 0

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Answered
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...

5 days ago | 0

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Answered
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...

5 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...

6 days ago | 0

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Answered
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 ...

6 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...

6 days ago | 0

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Answered
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...

6 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...

6 days ago | 0

Answered
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...

6 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...

6 days ago | 0

Answered
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 ...

6 days ago | 0

Answered
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...

7 days ago | 1

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Answered
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...

7 days ago | 0

Answered
Averaging non-aligned time-series arrays
Try something like this — time1 = [1 2 3 4]; data1 = [1 1 1 1]; time2 = [3 4 5]; data2 = [3 3 3]; TT1 = timetable(seconds...

7 days ago | 0

Answered
Error in ode45: issue with length of initial conditions vector
The ‘u’ function is either not being called correctly or not written correctly. In any event, it is miissing in the posted code...

8 days ago | 0

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How do I convert table data to double to manipulate them?
There are several ways you can convert or extract table data to an array. You can use dot notation or curly brace indexing, as...

8 days ago | 21

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Answered
How to interpolate data with different sample times
‘These structures have a field for time (in datenum format) and a field for value (lets say units of Watts)’ I would create t...

8 days ago | 0

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Intro to matlab lab and I have no idea how this works
Both questions seem to me to involve element-wise operations. See the documentation section on Array vs. Matrix Operations for...

9 days ago | 0

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How to get the values of the XAxis Minor Ticks (of an inset plot)
Assign the output to a variable — % create a plot x1 = linspace(0,1000); y1 = sin(2*pi*x1); plot(x1,y1) set(gca,'Fontsize'...

9 days ago | 1

Answered
How can I draw a frame around the inset plot?
Use an annotation object — x1 = linspace(0,1); x2 = linspace(3/4,1); y1 = sin(2*pi*x1); y2 = sin(2*pi*x2); figure(1) ...

9 days ago | 1

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Answered
Can gamultiobj skip over instances where the function cannot solve?
II am not certain about gamultiobj because I have very limited experience with it. However ti has been my experience when using...

10 days ago | 0

Answered
How to run a code (in series) in different folders?
Probably the easiest way would be to create ‘S4’ as a function and go from there. Example — pwd A = randi(10, 5) writemat...

10 days ago | 0

Answered
I need to innovatively produce a 140x8 matrix filled with random grades from 140 students
OPne approach is to use logiical indexing — StuGra=[60 70 80 90;50 40 30 20;20 20 20 90;10 90 10 90] Lm = StuGra < 50 ...

10 days ago | 0

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