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Star Strider


Last seen: Today
13,095 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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Contributions in
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Answered
Change value for another value
Consider this example: A = [99999 rand(1,2); rand 99999 rand; rand(1,2) 99999]; B = A; B(A == 99999) = 0 producing: A = ...

14 hours ago | 1

Answered
Inter-rater reliability
If I understand what your data are and what you want to do, The correct test for your data is Fleiss’s kappa statistic. As I re...

15 hours ago | 0

Answered
Edge distortion when resampling a signal
From the documentation: ‘When filtering, resample assumes that the input sequence, x, is zero before and after the samples it ...

17 hours ago | 0

Answered
x greater than y by some value
Perhaps: z = x > (y + 10)

19 hours ago | 0

Answered
3D Plotting in matlab
I assume ‘complex’ just means complicated, and not a function with real an imaginary arguments or output. If it is actually com...

19 hours ago | 1

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Answered
plotting ode warning with nor plot returned
It helps to look at the dsolve results: Bsol = S.B Asol = S.A that are: Bsol = 0 ...

19 hours ago | 0

Answered
RMSE between original and predicted values.
Please see my Comment replying to your Comment.

19 hours ago | 0

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Answered
standard deviation on power vs. frequency graph
It would help to have your data, however I created some to illustrate the approach: f = linspace(0, 0.5, 25); ...

20 hours ago | 0

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Answered
How to plot two MATLAB polar plot in a single figure?
The hold calls must go after the appropriate figure call, not before it. Example— a = linspace(0, 2*pi); r1 = abs(cos(a));...

22 hours ago | 1

Answered
Multiple Linear Regression using fitlm function
In a linear regression of any sort, there is only one intercept.

22 hours ago | 0

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Answered
How to calculate the derivate of an equation ?
To calculate a numerical derivative of a vector, use the gradient function. If ‘N’ is a vector, use gradient on it, then mult...

22 hours ago | 0

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Answered
take values from old matrix to newer
Create the output matrix ‘B’ as: B = A(all(A(:,3:5) >= 0, 2),:) % Result Example— A = [randi(9...

22 hours ago | 0

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Answered
Matlab gives no result when I use the ODE (Ordinary Differential Equations)
The differential equation is nonlinear (the ‘y^2’ term) and very few nonlinear differential equations have analytic solutions. ...

23 hours ago | 0

Answered
How to filter data that detects peaks or irregularities?
Several functions already exist to do that, among which are findpeaks, islocalmax, ischange, and others.

1 day ago | 0

Answered
Get an image as an input from webcam
I assume here that you are using a USB webcam, and not the Image Aquisition Toolbox. To take picture, use the snapshot functi...

1 day ago | 0

Answered
How to get a 3D image from 2D countourf?
Black surf plots are common with very densely-gridded data. To avoid that, set 'EdgeColor' to 'none': D = load('Pedobarograp...

1 day ago | 0

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Answered
Reverse calculate a table of values
I am not certain what a ‘3D table’ is. Perhaps you intend a three column table or array. If that is true, then the interp1 f...

2 days ago | 1

Answered
Sequence a_n =1/n
Use element-wise division: n = 1:100; format short Seq = 1./n producing: Seq = 1.0000 0.5000 0.3333 0.2500 ...

2 days ago | 1

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Answered
Calculate area under curve of multiple peaks
Using cumtrapz: [peaks,loc]=findpeaks(crestbar, 'MinPeakProminence', 30); [trofs,troflocs] = findpeaks(-crestbar, 'MinPeakPro...

2 days ago | 0

Answered
We need to install Global Optimization Tool
Try running these lines from a script or your Command Window first: restoredefaultpath rehash toolboxcache That may fix th...

2 days ago | 0

Answered
convert plot3 to contour plot
Use the griddata function: a = randi(9, 10, 3); x = a(:,1); y = a(:,2); z = a(:,3); xv = linspace(min(x), max(x), 6); ...

2 days ago | 0

Answered
Index exceeds matrix dimensions error "for my code"
It is unfortunate that we do not get the opportunity to see what ‘X’ is for the various files, nor anything else about them. ...

2 days ago | 0

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Answered
this is a part of my test and i cant find the mistake in this .
The obvious observation is that ‘x’ is going to be less than 10 from the initial iteration through how many iterations it takes ...

2 days ago | 0

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Answered
Error in saveas, Invalid figure handle
I cannot run your code because I do not have the necessary files. However: %% Let's plot T and RH times...

3 days ago | 0

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Answered
Custom colour bar, excluding the Blue from RGB.
Define ‘CustomColourMap’ as: CustomColourMap = @(x) [linspace(0,1,x).' linspace(1,0,x).' zeros(x,1)]; then to use it: Cust...

3 days ago | 0

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Answered
how to make fuction from changing varibles
That is relatively straightforward to do with ndgrid or meshgrid. Try this hypothetical example: Z = @(x,y,z) x.^2 + y.^2 +...

3 days ago | 0

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Add 0.5 *0.5 degree grid on figure (country)
This illustrates the general approach: x = linspace(44, 64); y = linspace(25, 40); t = linspace(0,2*pi); circx = 0.25*(ma...

3 days ago | 0

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Answered
How can i plot with if statement ?
Try this: x=[10 20 30 40 50 ] ; for k = 1:numel(x) if x(k)==10 y(k)=((10*10^6)*.1523)./ x(k) ; end if...

3 days ago | 0

Answered
Make a Plot using loop
Subscript ‘Cp’ and the plot magically appears! Dg=150; %mg Vd=50; %L Ke=0.4; %h^-1 Ka=1.6; %h^-1 t=0:0.1:10; for k = 1...

3 days ago | 0

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Answered
titel for tables with spce between the words
The R2019b release allows spaces and other (inluuding Unicode) characters in table variable names. Upgrade to it and you will b...

3 days ago | 1

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