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Star Strider


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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. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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Feeds

Respondida
Strange issue with mean, max, and min of vector?
See the plotted values — load('diffT.mat') whos('-file','diffT') % diffT neg_vals = nnz(diffT < 0) [lo,hi] = bounds(d...

alrededor de 8 horas hace | 0

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Respondida
How to iterate over data sets?
If you have the Signal Processing Toolbox, use the buffer function for this. dummy1 = (1:60).' bfr1 = buffer(dummy1, 12); ...

alrededor de 11 horas hace | 0

Respondida
File Issues after copying from another PC
The resample function is part of the Signal Processing Toolbox. You need to have the Toolbox licensed and installed before you ...

alrededor de 12 horas hace | 1

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Respondida
Removing outliers from the data creates gaps. Filling these gaps with missing values or the median of surrounding values does not address the issue.Why?
Your version/release is not stated, however beginning with R2017a, the filloutliers function has been available. Using the 'med...

alrededor de 20 horas hace | 0

Respondida
How do I find the x and y coordinates of a fitted Gaussian curve at a given slope?
Once you have the equation for the gaussian, the rest is striaightforward. Find the midpoint in the mamplitude to determine th...

alrededor de 20 horas hace | 0

Respondida
Optimal Cutoff Frequency for Static Noise Detection in ECG Signals?
You have not defined ‘static noise’ so I have no idea what you’re actually filtering. The bandwidth of a normal EKG is genera...

alrededor de 21 horas hace | 0

Respondida
How do I calculate the duration between two times?
This seems to work — load('results_start_array.mat') whos('-file','results_start_array.mat') load('results_start_end.mat')...

1 día hace | 0

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Respondida
how to fill color in 1/4 th circle
A new function in R2024a is the polarregion function. Try this — figure thetas1 = [0.5 1]*pi; radii1 = [1 2]; polarregi...

3 días hace | 0

Respondida
How to interpolate values given a starting and end point
Use the rescale function — Vrec = [18.2, 18.1, 18.0, 17.9]; Vrange = [50.6 50.3]; Vres = rescale(Vrec, Vrange(2), Vrange(1...

4 días hace | 0

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Respondida
How can i make 3D graph with multiple 2D graphs?
If the vectors all have the same sizes, just plot them as a matrix using the surf function. t = linspace(0, 1, 25).'; ...

5 días hace | 2

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Respondida
How to change the spectrogram magnitude to linear?
I susp[ect that you may actually want to use the pspectrum function with the 'spectrogram' type. To understand the differences ...

5 días hace | 0

Respondida
Best analysis to show how EEG ranges are similar
I’m not certain what you actually want to do. I would be tempted to use Fourier transforms, specifically stft, and compare th...

5 días hace | 0

Respondida
How to solve non_linear equation
Solve it symbolically — syms z Eqn = z^3 == log(z)*(482036/0.18525)^5 Z = solve(Eqn) Z = vpa(Z) format longG Zd = doub...

5 días hace | 0

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Respondida
How to find the intersection of linear regression model and yline
Use the interp1 function for this — T(:,1) = [0 1 2 3 4 5].'; T(:,2) = [0 1 2 3 4 5].'; x = T(:,1); y = T(:,2); p = poly...

6 días hace | 0

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Respondida
I am getting this warning "Matrix is singular to working precision." and my surf plot is not showing.
You need to do element-wise opeerations in your ‘u’ function, so: u = @(x,y)(-4*pi*exp(-5*pi*pi*0.5).*cos(2*pi*x).*sin(pi*y))....

6 días hace | 1

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Respondida
Designing Yulewalk Filter for a Bandpass Type
The yulewalk filter will be a FIR filter, whiel the original filter is an IIR filter. A FIR filter generally requires a much hi...

6 días hace | 0

Respondida
Confidence interval calculation. Cannot compute confidence interval for imaginary values.
The parameters aren’t complex. All the results are real. The problem with your code is that in MATLAB, function arguments an...

6 días hace | 0

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Respondida
How to correct the recording of a daamaged accelerometer in earthquake analysis
If you have the Signal Ptocessing Toolbox, an alternative approach would be to use the highpass (or bandpass to also eliminiate...

7 días hace | 0

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Respondida
How to use previous answer in new calculation n times
Perhaps something like this — A=[0.3 -0.2; -0.6 0.8]; B=[-14;2]; x=[1;2]; y = x; for k = 1:10 y = A*y+B; ym(:,k)...

7 días hace | 0

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Respondida
I have purchased the Signal Processing Toolbox but still get an error when trying to use a function
I am not certain what the problem is. imshow(imread('Screenshot 202....49.59 AM.png')) First, run these from a script or you...

7 días hace | 0

Respondida
difference between 2 values in a vector
Try this — x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 ...

8 días hace | 0

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Respondida
result spectrogram from lowpass filter still pass frequency above the treshold
See if: y=lowpass(yori,10,100, 'ImpulseResponse','iir'); improves the result. .

8 días hace | 0

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Respondida
F1(u,v)=0,F2(u,v)=0 with 4 parameters a,b,c,d, 3 of which (a,c,d) are given
a = 1.5; c = 0.4; d = 0.9; b=0.1:0.1:9; syms u v F1 = @(u,v,b) u*(1 - u) - b*u*v/(c*u + 1); F2 = @(u,v,b) 0.5*b*u*v/(c*u +...

8 días hace | 0

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Respondida
Unrecognized function or variable 'del'.
That should actually work — tic n = 0; for del=0.0:0.4:pi n=n+1; pe(n)=1.2*sin(del); end toc pe A mnore effi...

8 días hace | 0

Respondida
How to make sure that the horizontal axes of two figures align?
If the figures are open at the same time, you can use the linkaxes function. If they are not, you can use xlim one one figure a...

8 días hace | 0

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csv to fft matlab
You cannot calculate the Fourier transfomors without a corresponding sampling frequency or time vector. Assuming the sampling...

9 días hace | 0

Respondida
SENSITIVITY ANALYSIS OF A SYSTEM OF AN ODE USING NORMALIZED SENSITIVITY FUNCTION
I am not certain that this does everything you want, however it now has the virtue of running without error — epidemic1 fu...

9 días hace | 0

Respondida
what kind of plot is useful for comparing two matrices?
I am not certain that there is any built-in functtion for this sort of problem. One approach — M1 = randn(5) M2 = M1 + ran...

9 días hace | 1

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Respondida
How can I connect the upper endpoint of the red curve to the red dot while keeping the curvature nearly the same?
Here are options using pchip, makima and spline — clear all format long warning off figure set(0,'DefaultAxesFontSize',20...

10 días hace | 0

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Respondida
error in ode45 - function must return a column vector
It would help to have ‘dirfield’ (whatever it is). The other problem is that with one differential equation, ‘y0’ has to have o...

10 días hace | 0

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