# Star Strider

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**

fitting exponential decay help

It would be helpful to have your data. In any event, this sort of problem could be similar to that described in How to filter...

6 days ago | 0

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...

6 days ago | 0

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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); ...

7 days ago | 0

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 ...

7 days ago | 1

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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...

7 days ago | 0

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...

7 days ago | 0

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...

7 days ago | 0

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')...

8 days ago | 0

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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...

9 days ago | 0

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...

10 days ago | 0

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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).'; ...

11 days ago | 2

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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 ...

11 days ago | 0

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...

11 days ago | 0

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...

11 days ago | 0

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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...

12 days ago | 0

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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))....

12 days ago | 1

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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...

12 days ago | 0

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...

12 days ago | 0

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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...

13 days ago | 0

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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)...

13 days ago | 0

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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...

14 days ago | 0

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 ...

14 days ago | 0

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result spectrogram from lowpass filter still pass frequency above the treshold

See if: y=lowpass(yori,10,100, 'ImpulseResponse','iir'); improves the result. .

14 days ago | 0

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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 +...

14 days ago | 0

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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...

14 days ago | 0

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...

14 days ago | 0

csv to fft matlab

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

15 days ago | 0

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...

15 days ago | 0

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...

15 days ago | 1

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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...

16 days ago | 0

| accepted