How to solve 'Index exceeds the number of array elements (1)'

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Lima Parhiz 2019-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/486599-how-to-solve-index-exceeds-the-number-of-array-elements-1

评论： KALYAN ACHARJYA 2019-10-25

Hello

I have to compute the power spectrum of EEG and LFP signals for an assignment. I have written a function for computing the autospectrum and I have to use the imagesc function in order to generate the power spectra. Due to requirements for my assignment, I cannot use the function spectrogram.

Computing the autospectrum values works fine however when I have to plot the spectra, I get the error "Index exceeds the number of array elements (1)". I am writing this for my code for plotting the spectrograms:

   % Plotting spectrogram 
    b = F < 200;           % Boolean variable indicating frequency range 
    figure
    imagesc((t(1:min(N_col))/60),F(b),conv2(10*log10(P_norm(b,:)),ones(5,2)/10,'same'))
    caxis([-3 3])
    set(gca,'YDir','default')
    colormap jet
    xlabel('Time (min)')
    ylabel('Frequency (Hz)')
    h=colorbar;
    ylabel(h,'Power relative to baseline (dB)') 
    title([TT.BRAINREGION{j} ', Dose:' num2str(TT.DOSE(j)) 'mg/kg'])
    pause

Is there some sort of error in the Imagesc line? I am unsure how to solve the issue.

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Kaashyap Pappu 2019-10-25

There is a chance the value of "b" is too high for indexing into an array. However it is hard to say what exactly is causing the error, as the cyclist has already mentioned.