Community Profile # 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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this plot3 looks 2D on live script (pointing downwards as it should), and 3D (pointing sideways for no reason), why?
I cannot run that since the data are missing. However to see it in all its 3D glory, use the view function to rotate the came...

alrededor de 6 horas ago | 0

Array Indexing and Function Handling question.
It would be necessary to define ‘F’ in terms of a single parameter vector — F = @(xy) [3*xy(1)+xy(2).^2 , xy(1).^2+3*xy(1)-1];...

alrededor de 6 horas ago | 1

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How to put endpoint on Bar graph
In R2021b, this is straightforward (and described in Specify Labels at the Ends of Bars). y = [75.8 78.05; 81 80.30; 91 80...

alrededor de 7 horas ago | 1

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how can I change my time so that it takes frequency 1/250 hz
If is the sampling interval, multiply it by the sampling instants to convert them to time — C = readtable('https://www.math...

alrededor de 7 horas ago | 0

How to plot color ball use matlab?
This is an interesting problem! This should get you started — Facets = 40; numPatches = fix(Facets/5); [X,Y,Z] = sphere(F...

alrededor de 11 horas ago | 1

split an audio file
Unless it is absolutely necessary to use reshape, use buffer instead. It is just easier. It only operates on one vector at a...

alrededor de 15 horas ago | 1

matlab font 2021b
There is likely a way to set this programmatically, however the easiest way to change the fonts is to click on Preferences, then...

alrededor de 15 horas ago | 0

How do I increase the x-axis to make my action potentials bigger
The X-limits need to be reduced in order to show the detail, and the last subplot needs to have its axes rescaled to show the de...

1 día ago | 0

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Symbolic ODEs aren't symbolic?
Because of the ‘R*s’ terms, the system is nonlinear. The vast majority of nonlinear differential equations do not have analytic...

1 día ago | 0

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How to calculate the duration of data points in days

1 día ago | 0

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Error in ode45 (line 115) and odearguments (line 90)
There were two errors. First: dydt(2)=y(2)*(1-y(2))*((y(1)*(or*rr-br*re)-ar*rr); ↑ ← EXTRA UNMATCHE...

1 día ago | 0

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How to avoid using a loop here?
One approach — N = 5; tic [m,n] = ndgrid(1:N); A = 2*N + 1 - (m + n) toc Compare — tic A = zeros(N); for m = 1:N ...

1 día ago | 0

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Timeformat from HH:MM:SS to HHMMSS
Try this — time = datetime('12:30:00', 'InputFormat','HH:mm:SS', 'Format','HHmmSS') .

1 día ago | 0

Replace comma with dot after fopen
For MATLAB versions R2019a and later, the readmatrix function permits definition of the 'DecimalSeparator' (see the Text Files O...

1 día ago | 0

How to solve an ODE calculating the value of a variable inside a loop?
The problem is: x0 = X(end); so the error only occurs after the first iteration. The solution is: x0 = X(end,:) and thi...

1 día ago | 1

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how can I get the following graph from this data, changes are required in the code

2 días ago | 0

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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...

2 días ago | 0

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 ...

2 días ago | 1

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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...

3 días ago | 0

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...

3 días ago | 0

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...

3 días ago | 0

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 ...

3 días ago | 0

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

3 días ago | 0

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...

3 días ago | 0

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

3 días ago | 0

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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...

3 días ago | 1

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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...

4 días ago | 0

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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...

4 días ago | 1

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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(...

4 días ago | 0

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