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Lowpass vs bandpass filtering
The functions may by default design a FIR filter, and FIR filters have problems with some signals, since the FIR filter order ma...

1 month ago | 0

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Plotting error bars on curve
I really can’t do anything without the data. The rest of the code (that imports the data and processes it including calculating...

1 month ago | 0

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Answered
3D Figure from Excel (x,y,z)
It always helps to have your data. A picture may be worth a thousand words, however on MATLAB Answers, data is worth a thousand...

1 month ago | 0

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Answered
MATLAB FFT bin size
I agree with @Steven Lord, however there are ways to do what you want with the MATLAB fft function. I wrote a small utility fun...

1 month ago | 1

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Answered
I would like to plot an interpolated 3d Surface between two faces, i.e. the third face of a truncated cone. my plot isn't working but I'm not sure what is wrong
TThis does not look like a cone to me at all. What do you want to do? r1=0.5; % t1=[(0:0.1:2*pi),0]; t1=0:0.1:2*pi; X1=...

1 month ago | 0

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Answered
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...

1 month ago | 0

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Answered
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); ...

1 month ago | 0

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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 ...

1 month 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...

1 month ago | 0

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Answered
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...

1 month ago | 0

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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...

1 month ago | 0

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Answered
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 month ago | 0

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Answered
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...

1 month ago | 0

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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...

1 month ago | 0

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Answered
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).'; ...

1 month ago | 2

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Answered
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 ...

1 month ago | 0

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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...

1 month ago | 0

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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...

1 month ago | 0

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Answered
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...

1 month ago | 0

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Answered
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))....

1 month ago | 1

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Answered
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...

1 month ago | 0

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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...

1 month ago | 0

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Answered
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...

1 month ago | 0

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Answered
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)...

1 month ago | 0

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Answered
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...

1 month ago | 0

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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 ...

1 month ago | 0

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

1 month ago | 0

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Answered
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 +...

1 month ago | 0

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Answered
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...

1 month ago | 0

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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...

1 month ago | 0