MATLAB Answers


What is the solution for below code? It shows error

Asked by Yasir Ali on 18 Feb 2019
Latest activity Commented on by Star Strider
on 19 Feb 2019
t=0:0.001:2; %sec @ 1 khz sample rate
x=chirp(t,0,1,150); %start @ DC ,cross 150 HZ at t=1 sec
[y,f,t,p] = spectrogram (x,256,250,F,1E3,'yaxis');
% this is the same as calling spectrogram with no outputs
axis xy; axis tight; colormap(jet);view(0,90);
xlabel ('time');
ylabel('Frequench (HZ)');
[y,fs] =audioread('filename.wav');
[,F,T,P]= spectrogram(y,NW,[],[],fs);
Error using Spectrogram>chkinput (
Xmust be a vector(either row or column)
Error in spectrogram (line166) chkinput (x);


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1 Answer

Answer by Star Strider
on 18 Feb 2019

I suspect the error refers to this assignment:
[,F,T,P]= spectrogram(y,NW,[],[],fs);
(that also seems to be missing an output, so it will throw an error). I assume that you intend:
[Y,F,T,P]= spectrogram(y,NW,[],[],fs);
Note that the second assignment to ‘y’ is the result of:
[y,fs] =audioread('filename.wav');
and if ‘y’ is a stereo signal, it will have 2 columns, so check that with the size function. The most likely correction is to choose one of them for each spectrogram call.


Please read the spectrogram documentation and adjust your variables to what it requires.
I gone through it but Iam not understanding how to adjust according my choice I have try my level best but I unable to find a good result as I am not much familiar with matlab programming thats why Iam asking to help for coding .
The documentation describes all of this much better than I can. You will likely have to experiment with your code until it does what you want it to.
That is how I learned programming, and likely how the rest of us here learned.

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