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Star Strider


Last seen: Today
13.088 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
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); ...

ongeveer een uur ago | 0

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));...

ongeveer 2 uur ago | 0

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

ongeveer 3 uur ago | 0

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...

ongeveer 3 uur ago | 0

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...

ongeveer 3 uur 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. ...

ongeveer 3 uur 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.

ongeveer 5 uur 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...

ongeveer 15 uur 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...

ongeveer 21 uur 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...

ongeveer 23 uur 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 ...

1 dag 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...

1 dag 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...

1 dag 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); ...

1 dag 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. ...

1 dag 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 ...

1 dag ago | 0

| accepted

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...

2 dagen 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...

2 dagen 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 +...

2 dagen ago | 0

Answered
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...

2 dagen 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...

2 dagen 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...

2 dagen 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...

2 dagen ago | 1

Answered
How to change the size of error bar?
I am not certain what you want. Try this: errs = rand(1,10); x = 1:10; y = randi([10 20],1,10); figure plot(x, y) ho...

3 dagen ago | 1

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Answered
Ending a recursive function
I have not run your posted code, however two things are immediately apoparent. First, in the calls to ‘mysequence’, the fun...

3 dagen ago | 0

Answered
Relational operator == doesn't work properly in some cases!
You are seeing the effects of floating-point approximation error. See for example: Why is 0.3 - 0.2 - 0.1 (or similar) not e...

3 dagen ago | 0

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Answered
C.T. signals convolution in Matlab
One approach: syms h(t) x(t) s t Fcn1 = h(t) == exp(-2*t)*4 - 4*exp(-t); Fcn2 = x(t) == heaviside(t); convlap = laplace(Fc...

3 dagen ago | 0

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Answered
how can i Solve this equation With ode45
Try this: syms y(t) w T Y DE = diff(y,2) + w; [VF,Subs] = odeToVectorField(DE) ODEfcn = matlabFunction(VF, 'Vars',{T,Y,w})...

3 dagen ago | 0

Answered
Problem using function fsolve
Use a different initial parameter estimate vector. Try this: z0 = rand(3,1); Your code divides the parameters by each othe...

3 dagen ago | 0

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Answered
Creating a 3d plot of the solutions to an ODE as the time a switch condition activates varies
I am not certain what you want to do. Try this: function L2_ode45 tspan = linspace(0, 500, 50); t1 = 100:100:500;...

3 dagen ago | 1

| accepted

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