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calculate snr of digital signal
This is not correct. The second input to snr must be a real-valued row or column vector that must have the same dimensions as th...

alrededor de 4 años hace | 0

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DTMF decoder .wav files code
It's a problem with your window size. Like I mentioned in a previous iteration of this question, you can look detect a proper wi...

alrededor de 4 años hace | 1

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How do I generate a given Matrix in one command?
T = toeplitz([1 -1 0 0 0 0],[1 8 0 0 0 0])+diag(0:5)

alrededor de 4 años hace | 0

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How to plot data with very small differences
You can try using *stem* or *scatter* or playing the *axis* limits. Or just plot the residuals, which is a pretty standard thing...

alrededor de 4 años hace | 0

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Two outputs when calculating standard error of mean, WHY?
It's because size(A) returns two outputs. If you want to use the size of A in a particular dimension, use size(A,dim). (Since |s...

alrededor de 4 años hace | 1

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3d Plotting Using Meshgrid
Replace for i=1:1:length(n) for j=1:1:length(m) [X,Y]=meshgrid(i,j); %disp(f(X,Y)); mesh...

alrededor de 4 años hace | 1

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Switch the x axis direction where positive values are on the left side of the y axis
figure plot(1:10) set(gca,'XDir','reverse')

alrededor de 4 años hace | 0

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how do I re-sample a continuous function; but maintain shape?
You can unaccept the answer if you want to keep it open, but also consider this answer. (For 3, I meant you're measuring from r...

alrededor de 4 años hace | 1

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How do I organize repetitive values within a vector into a new vector that only has one of every repetitive value?
Your title and your description ask two very different questions. Your description is basically how to use XTick and XTickLabel ...

alrededor de 4 años hace | 1

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Printing .m to pdf on Linux
publish('myscript.m','pdf'); It will publish any figure or anything that prints to the command line as well.

alrededor de 4 años hace | 0

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how do I re-sample a continuous function; but maintain shape?
I see several potential reasons why this is occuring. 1) There will be general broadening of the signal due to downsampling. 2...

alrededor de 4 años hace | 1

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Random number, Random integer
x = 2:6; y = x(randperm(length(x),2));

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mscohere function (equations used for it)
You can view the code by typing into the command window open mscohere % then subsequently open welch and follow along. You c...

alrededor de 4 años hace | 1

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improving result of FFT
You'll want to use it as the second input to the fft. This will affect your frequency vector |fvec| though. n = 2^nextpow2(...

alrededor de 4 años hace | 0

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What can I know from the spectrogram of mp3 and wav file
It's difficult to say given that they are plotted with two different colorbar axes limits. Set them to be the same and you can v...

alrededor de 4 años hace | 0

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FFT size. Determine K so that K is a power of two
If you sampling frequency is 4000 Hz, then to get a resolution of 20 Hz you need to take an N-point fft, where N = 4000/20 = 200...

alrededor de 4 años hace | 2

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How to get rid of ringing/overshoot in an ecg signal while using notch filter?
clearvars clc close all fs = 500; ecg = xlsread('Noisy_50HZ_ECG.xlsx'); ecg = detrend(ecg.'); ecg = sgolayfilt(ecg,0,5...

alrededor de 4 años hace | 1

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Multiple Summation of Series using For Loops (Magnetic Flux through Coil Simulation)
Hi Samuel, I don't see anything wrong with the code. The only thing I would change is to do the following outside the loops: ...

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How to Take Inverse Fourier Transform?
You have essentially done this: Y1 = fftshift(fft(h38)); Y1 = abs(Y1); P1 = Y1; iP1 = ifft(P1); Of course iP...

alrededor de 4 años hace | 0

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collapsing redundant entries in MATLAB table
Use |groupsummary|: <https://www.mathworks.com/help/matlab/ref/double.groupsummary.html>

alrededor de 4 años hace | 1

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How to take gradient, curl or divergence of numeric vector fields?
You can use the |curl| and |divergence| functions which are not in the symbolic toolbox: <https://www.mathworks.com/help/matl...

alrededor de 4 años hace | 0

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Random number multiple of 5 generation
First find out how many possibilities there are: interMin = 20; interMax = 150; n = sum(~mod(interMin:interMax,5)); % n = 27...

alrededor de 4 años hace | 0

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Why won't my graph plot?
It did plot. Try this: plot(FS,d,'bo') It's just that FS and d only contain 1 element. You need to understand how to store da...

alrededor de 4 años hace | 0

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How would you approach this problem?
I don't understand the second truth table, but the first one can be done as follows: actual = [0;0;1;1]; next = [0;1;0;1]; ...

alrededor de 4 años hace | 1

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How can I combine complex spectrogram results as an image for multi-channel EEG signal?
It usually takes a lot of work to get a figure to look just right. Here is what I came up with quickly, you can play around with...

alrededor de 4 años hace | 2

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How can I combine complex spectrogram results as an image for multi-channel EEG signal?
Take all your outputs from spectrogram, and assuming they are all sampled at the same time/freqs, just stack them (concatenate) ...

alrededor de 4 años hace | 2

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How to use the result of my matrix calculation to create 2D plot
l1,l2, and Z are all a single value. You need to understand how to store values in a for loop: https://www.mathworks.com/help/m...

alrededor de 4 años hace | 0

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time domain and frequency domain
Code looks fine to me. Not sure what you mean by N being 2^N. The only thing I would tweak is setting tvec = (0:N-1)*delt; As...

alrededor de 4 años hace | 0

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extract data with unique ID
As Walter also suggested: [~,~,locGroups] = unique(subs(:,1)); % also look at [~,~,locGroups] = unique(subs(:,1),'stable'); ...

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how to handle this issue "Error using regexprep"
% Assuming this is what you have... labels = {{["usm1" ]} ,{["usm2" ]},{["usm3" ]},{["usm4" ]},... {["owrl1"]},{["owrl2"]}...

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