MATLAB: Concatenate two audio files

audio

I would like to concatenate two audio files such that a new audio signal is created whereby the first audio plays and this is then immedialely followed by the second.
  [y1,Fs] = audioread('sample1.wav');
  y1_sample_rate = 8000;
  [y2,Fs] = audioread('sample2.wav');
  y3 = [y1(1:y1_sample_rate,:); y2;];
What am I doing wrong?
Thank you.

Best Answer

If your intentions are to subsample every 8000 values in y1 and then concatenate y2 to the end, 
y3 = [y1(1:y1_sample_rate:numel(y1)); y2]; 
%                         |________|    ^ no need for semicolon
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