How to fix Index exceeds array bounds?

%% Visualize Data
% Plot the waveforms and spectrograms of a few training examples. Play the
% corresponding audio clips.
specMin = min(XTrain(:));
specMax = max(XTrain(:));
idx = randperm(size(XTrain,2),3);
figure('Units','normalized','Position',[0.2 0.2 0.6 0.6]);
for i = 1:3
    [x,fs] = audioread(adsTrain.Files{idx(i)});
    subplot(1,2,i)
    plot(x)
    axis tight
    title(string(adsTrain.Labels(idx(i))))
    
    subplot(2,3,i+3)
    spect = XTrain(:,:,1,idx(i));
    pcolor(spect)
    caxis([specMin+2 specMax])
    shading flat
    
    sound(x,fs)
    pause(2)
end

I want to plot the audio waveforms and spectograms but it gives me error. Am I missing something?

Index exceeds array bounds.
Error in DeepLearningSpeechRecognitionExample (line 117)
    [x,fs] = audioread(adsTrain.Files{idx(i)});

Answer 1

[Cris LaPierre]

It means your code is indexing to a non-existant location in either idx or adsTrain.Files.

You can read more here.