Spectrogram error with multiple errors
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Hello,
I keep getting the following error when I try to do a spectrogram: Subscript indices must either be real positive integers or logicals.
Error in getSTFTColumns (line 14) xin = x(rowindices+coloffsets);
Error in pspectrogram (line 55) [xin,t] = getSTFTColumns(x,nx,nwin,noverlap,Fs);
Error in spectrogram (line 168) pspectrogram({x},'spect',varargin{:});
This is what I am doing:
% Trying to use this code: spectrogram(x,window,noverlap,f,fs) so that I can see the spectrogram in terms of frequency and time
% x is my signal
% fs = 128
% N = 15360
% The frequency range I want to look at is between 2-35Hz
figure
spectrogram(x,hanning(2*fs),0.5,[2 35],fs)
4 个评论
Rishabh Rathore
2018-10-1
From the error message shared by you, it looks like you might be accessing the out of bound array elements or value of either "rowindices" or "coloffsets" might not be real positive integer.
Moreover, please explain what is "getSTFTColumns" and what do you want to accomplish with: -
xin = x(rowindices+coloffsets);
Krithika A
2018-10-1
Rishabh Rathore
2018-10-1
编辑：Rishabh Rathore
2018-10-1
Can you please share your signal "x" and a screenshot of the error message(or messages). And is "N" number of samples?
Krithika A
2018-10-1
采纳的回答
Rishabh Rathore
2018-10-3
The "noverlap" should be a positive integer as it represents the number of samples of overlap with previous window. Hence the 50% overlap would be floor(win_size/2).
I'm attaching the figure that I obtained after making the changes using your input signal.
Since your window size is 2*fs, the 50% overlap will be "fs". Hence the use of the function "spectrogram" should look like: -
spectrogram(x,hanning(2*fs),fs,[2 35],fs);
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