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Star Strider


Last seen: Today Active 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
how can I get the following graph from this data, changes are required in the code
Try something like this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/771138/G2_A.txt', 'Va...

ungefär 2 timmar ago | 0

Answered
How do i fix line13; Parse error at'=': usage might be invaild Matlab syntax? why it gives error ?
If you are referring to Line 13, it appears that there is nothing to the left of the equal (=) sign. Perhaps the intention is...

ungefär 3 timmar ago | 0

Answered
How can i make my ODE graph make sense?
The fplot call is incorrect, and the function declines so quickly that it’s not possible to see it clearly with a time interval ...

ungefär 11 timmar ago | 1

| accepted

Answered
Connect datapoints in Plot
Use plot instead of scatter. .

ungefär 14 timmar ago | 0

Answered
Is it possible to save ECG waveform data as an text file with RR-intervals?
I am not certain what the desired result is. Try this — EKGsig = readmatrix('https://www.mathworks.com/matlabcentral/answer...

ungefär 15 timmar ago | 0

Answered
How to code SIR system to see state after time of each individual?
The ‘SIR’ model is a compartmental model. It tracks the dynamics of compartments, not individuals, so I doubt that it is possib...

ungefär 16 timmar ago | 1

Answered
Legend not matching the data
It is possible to label the individual plots in the plot calls. See Specify Legend Labels During Plotting Commands for detail...

ungefär 16 timmar ago | 0

Answered
Solving system of coupled ode using ode45
The NaN values are the result of the initial conditions all being 0. With a bit of cheating (setting the initial conditions all...

ungefär 17 timmar ago | 0

Answered
Torque ripple plot in MATLAB
Try something like this — t = linspace(0, 720, 1000); s = [sind(2.5*t); sind(2.5*t+180)]; figure plot(t,s, '--') hold ...

en dag ago | 0

Answered
what changes are needed
Try this — F = openfig('Manav Divekar untitled.fig'); F.Visible = 'off'; % Don't...

en dag ago | 0

Answered
How to create a table to show the results of a function code?
Subscript the variables so they are column vectors, then put them in the table and return the table as one of the outputs (or pe...

en dag ago | 0

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Answered
Function keeps running into errors when I call it
Try this instead — hpeakt = sorteddata.data(:,1); wpeakt = sorteddata.data(:,5); [phivalues] = findphases(wpeakt,hpeakt)...

en dag ago | 0

| accepted

Answered
converting sym function to string MATLAB
Try this — syms x y eqn = x^2+2*x*y+3*y^2; partial_eqn = diff(eqn, x); fprintf("The partial derivative of %s w.r.t. x is...

en dag ago | 1

| accepted

Answered
Use results in the definition of my functions
Try this instead — function pv=p(X,x) pv=X(1)*x.^2+X(2)*x+X(3); end Here, ‘X’ are the parameters and ‘x’ is the variabl...

en dag ago | 0

| accepted

Answered
Could someone please explain me this code?
That looks like something I wrote! It would be helpful to know the context (I don’t remember where I posted it), however it a...

2 dagar ago | 1

| accepted

Answered
Integrating a 2nd order ODE
This is a boundary value problem. Use bvp4c to solve it. syms y(x) x L Y q(x) = 2*cos(pi*x/L); Dy = diff(y); D2y = diff(...

2 dagar ago | 0

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Answered
How can I call half of text by using "textread" ? (1*4096 matrix to 1*2048 matrix)
I have never used textread, however that could be described in the format string, for example — formatStr = [repmat('%f',1,204...

2 dagar ago | 0

| accepted

Answered
I don't understand what this means or how to do it
I would imagine that ‘the next question’ wants the result at some very large valur of ‘t’, however that assumes that the fractio...

2 dagar ago | 0

Answered
my fminsearch function doesn't get the optimum values
The fminsearch function searches for a minimum. To get a maximum, negate the function — [x,fval] = fminsearch(@(x)-tut2(x),[1...

3 dagar ago | 1

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Answered
plotting a for loop returns Empty Graph
I’m not certain what you want, however it is necessary to subscript the varialbes to be plotted. This runs without error and ...

3 dagar ago | 0

Answered
Area between three curves
Try this — I created the comparisons as ‘>=’ so change those to simply ‘>’ ito make the comparisons strictly ‘greater than’. ...

3 dagar ago | 0

Answered
Hi, I want to know knee point of a curve including the process of by 2nd derivative. Can anyone help by creating the script.
Use the gradient function to calculate the numerical derivative — x = linspace(0, 10); y = exp(-0.1*x) .* sin(x); D1 = g...

3 dagar ago | 0

Answered
how can I plot 3d in matlab
Another option is the waterfall plot. .

3 dagar ago | 0

Answered
I have to use Fourier Transform without frequency range?
One approach — A = [1 0.43 0.95]; B = [0.97 0.43 0.97]; [h,t] = impz(B,A); figure subplot(2,1,1) plot(t, h) grid ...

3 dagar ago | 0

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Answered
Turn multiple columns into one column
The code is a bit difficult to follow. I’m guessing here that you want to save the ‘allfrequency’ vectors. allfrequency(s,:)...

3 dagar ago | 0

Answered
To find the average of values in matrix
Try something like this (assuming that they are stored as elements of a cell array similar to these) — C = {randn(131,160), ra...

3 dagar ago | 0

Answered
Index exceeds the number of array elements in ODE using anonymous function
There’s a typo: 1/L13*(x(24) - (x(30)/C15 + (x(25) - x(31))*R1) - x(25*RL13)); ...

4 dagar ago | 0

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Answered
Incorrect datatype when using 'retime' function
The retime function works only with timetable arrays, to the best of my knowledge. See if using the table2timetable funciton fi...

4 dagar ago | 0

Answered
Bug in equality checks? 28.15e-3 == 28.15/1000 false
Wellcome to the world of floating-point approximation error! See Why is 0.3 - 0.2 - 0.1 (or similar) not equal to zero? and...

4 dagar ago | 1

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Answered
Problems with the three-parameter Weibull distribution
Those lines estimate the parameters of the distribution using Maximum Likelihood Estimation with the mle function, so look throu...

4 dagar ago | 0

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