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Star Strider


12,114 total contributions since 2012

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.

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Answered
Finding the nonzero element in a specific row
Select the row, then use find: A = [1 3 0; 2 0 4; 0 7 9] DesiredRow = 2 cix = find(A(DesiredRow,:) ~= 0) so: A = 1...

24 minutes ago | 0

Answered
Why does Matlab substitute a number in a formula instead of solving it?
The Symbolic Math Toolbox outputs its results as symbolic expressions, unless you ask it to do otherwise. (It assumes you want ...

1 hour ago | 0

Answered
Improving Presentation of a Graph
If you want your plots to have a finer resolution with respect to ‘R’, define ‘Rv’ to have more points: Rv = linspace(1, 10, 1...

5 hours ago | 0

Answered
Harmonic spectrum of the voltage data
Try this: D = dlmread('voltage_u.txt','\t', 4, 0); D = D(1:end-1,1:2); % First Two Co...

6 hours ago | 0

Answered
What's the best way to solve an equation in this example?
Try this: myFZERO = @(F) fzero(F, 10); % Hard-Coded Initial Estimate a = @(x) x.^2-5; ...

8 hours ago | 2

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Answered
Finding the volume of individual surfaces of a surf plot?
Unfortunately, you did not post your data, so I created some. You will have to adapt this to your data: [X,Y] = meshgrid(1:...

17 hours ago | 0

Answered
Is it possible to plot a plot() and area() on same axis
Use the hold function: B57 = rand(1, 100); % Create ‘B57’ y1 = B57; PlotAX1 = axes; ...

23 hours ago | 0

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Answered
Checking whether one row of an array is equal to the rows in a separate array
I would be tempted to use the ismember function with the 'rows' option (or ismembertol with the 'ByRows' option).

24 hours ago | 3

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Answered
Issues executing while loop
When I ran the code you posted, the while loop becomes infinite if ‘min(DPnew)’ is negative. In that event, this expression: ...

1 day ago | 0

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Answered
Output of the function conv2 is not the size I expected?
Reverse the order of the arguments (so that the smaller size matrix is first), then use the 'same' shape argument: C = conv2(B...

1 day ago | 0

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Answered
Calculate difference between two signals
I would compare them by noting that the amplitudes of the peaks vary with respect to the independent variable, similarly for bot...

1 day ago | 0

Answered
Plot of dspesific rows and columns
Importing your file depends on what is in it (numeric only, numeric with text headers, or something else). If you have R2019a o...

1 day ago | 0

Answered
Using Two Model Functions With LSQCUREVFIT
‘Do I need to call one PredCurrFun and the other PredCurrFun2, and LSQCURVEFIT can use both?’ Yes, in separate calls and othe...

2 days ago | 0

Answered
dealing with negative indices error
There turned out to be three problelms with your code that I corrected here. The original one was due to your forgetting an o...

2 days ago | 1

Answered
"Glitches" in transfer function
Precision could certainly be a problem, especiall considering the magnitudes of those numbers. (MATLAB retains full internal pr...

2 days ago | 0

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Answered
Delete data with some requirements
Try this: D = load('Xsample_data.txt'); X = D(:,1); Y = D(:,2); Zx = D(:,3); Zy = D(:,4); Lvx = (Zx < -2.5) & (Zx > 2...

2 days ago | 0

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Answered
Plotting Multiple Curves on the Same Graph
It depends on your function and what you want to do: t = linspace(0, 2*pi); freq = [1 5 9]; ampl = [1 2 3]; s = bsxfun(@tim...

2 days ago | 1

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Answered
How to add two cell arrays of the same dimensions
Try this: A = [{rand(1,4)} {rand(1,5)}]; B = [{rand(1,4)} {rand(1,5)}]; Out = cellfun(@plus, A, B, 'Uni',0)

2 days ago | 0

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Answered
why my plot not being displayed?
If your code involves array division, remember to use element-wise division: ./ rather than /.

2 days ago | 0

Answered
How can I extract the amplitudes of standared EEG bands in a 1 channel EEG signal
There are several posts that cover this. If you have R2018a or later, use the bandpass fucntion to design your filters. Get bo...

3 days ago | 0

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Answered
Boolean to return true if the cell is empty/nan
It would be easier if we had your code to work with. Try this: ~isnan(AU{row+1, col}) Address the cell elements using {}. ...

3 days ago | 0

Answered
Steps after ICA on unknown signals
ICA is not going to tell you that, because it does not know. It simply separates the signals. You must then so whatever sort o...

3 days ago | 0

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Answered
how do I plot different 3D peaks in different locations in single polar plot
Try this: N = 500; rv = linspace(0, 1, N); % Radius Vector av = linspace(0, ...

3 days ago | 1

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Answered
bar plot cannot spread x axis homogeneously
Either add a xlim call, or define both axes limits at the same time, and replace your ylim call with an axis call: axis([0 20 ...

3 days ago | 1

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Answered
How to plot LSQCURVEFIT output
It is not easy to follow your code. In order to use the linspace result, you need to put ‘xdata’ in your ‘GlobalChiSq’ functi...

4 days ago | 0

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Answered
How to use Maths Font for Graphs in MATLAB
I’m not certain what you want. The text objects have an Interpreter name-value pair argument that ill allow you to do annotat...

4 days ago | 0

Answered
For loop index assistance
I do not understand the reason you are indexing ‘j’ as a for loop. I would do something like this to get consecutive ‘j’ vect...

5 days ago | 0

Answered
find() not as expected
You have encountered ‘automatic implicit expansion’ introduced in R2016b. The result you get from your equality expressions wil...

5 days ago | 0

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Answered
Plotting hyperplane created using meshgrid (something simple)
I am not certain what you want to do. One approach: N = 25; y = linspace(-20,0,N); x = linspace(-50,50,N); z = linspace(...

5 days ago | 0

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Answered
how to plot ellipsoid?
Try this (partially copied from the documentation page Connecting Equal Values with Isosurfaces): x = linspace(-10, 10, 50); ...

5 days ago | 0

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