how to fix the following error?

dear Seniors and Experts I need solution for following code kindly help me to fix it .

data is

y=195840*2 double 
fs=48000

t=0:0.001:2;                    % 2 secs @ 1kHz sample rate
      x=chirp(t,0,1,150);             % Start @ DC, cross 150Hz at t=1sec 
      F = 0:.1:100;
      [y,f,t,p] = spectrogram(x,256,250,F,1E3,'yaxis'); 
      % NOTE: This is the same as calling SPECTROGRAM with no outputs.
      surf(t,f,10*log10(abs(p)),'EdgeColor','none');   
      axis xy; axis tight; colormap(jet); view(0,90);
      xlabel('Time');
      ylabel('Frequency (Hz)');
[y,fs]=audioread('Mithe Mustafa Tey 5sec.mp3');
NW = round(fs*0.250);
[S,F,T,P] = spectrogram(y,NW,[],[],fs);

Error using spectrogram>chkinput (line 252)

X must be a vector (either row or column).

Error in spectrogram (line 166)

chkinput(x);

while I click on line 252 and 166 it shows this

line 252 = error(message('signal:spectrogram:MustBeVector', 'X'));

line 166 = chkinput(x);

Answer 1

[Yasir Ali]

Thanks Dear walter If I wish to plot both channels then how to do that?

[Walter Roberson]

subplot(1,2,1)
spectrogram(y(:,1), NW, [], [], fs);
title('left channel')
subplot(1,2,2)
spectrogram(y(:,2), NW, [], [], fs);
title('right channel')

[Jan]

@Yasir: This is not an answer, which solves the question. Marking it as "accepted" means, that your problem is solved by this answer. Please post comments in the section for comments.

Answer 2

[Walter Roberson]

Your mp3 is stereo, 2 channels. spectrogram() can only process one channel at a time.

You need to do one of the following:

1. Choose one of the two channels and only process that one; or
2. combine the two channels into one, such as by using mean(); or
3. call spectrogram twice, once for each of the channels.

[Yasir Ali]

Dead walter kindly edit the code as you mentioned please

[Walter Roberson]

[S,F,T,P] = spectrogram(y(:,1), NW, [], [], fs);

[Yasir Ali]

Dear Walter can you tell me what this picture refers? It is the result of code is it frequency response? Dear Walter kindly explain it if you have time your comment and guideline will highly appreciated.

[Walter Roberson]

https://www.mathworks.com/help/signal/ref/spectrogram.html

The x axis is frequency. The y axis is time. The color is power.

[Yasir Ali]

Dear walter one last guideline require I found your comments very helpful

In above code I have try to get frequency response of audio in milisecond is it good code for getting frequency in miliseconds? ?

And when I try to get spectrum above 300 like 350 ms or more than error comes index dimension exceeds.

[Walter Roberson]

I am not sure. My calculation at the moment is that with your window of 256 that you would get resolution to about 375 Hz, but I do not trust those calculations at all.