Concatenating cuts off length of overall .wav file (when summed)

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asg_123
asg_123 2018-2-16
loc = 'insert dir of where you placed your files here';
filenames = {...
[loc, '\', 'audio1.wav'],
[loc, '\', 'audio2.wav'],
[loc, '\', 'audio3.wav']};
concat = [];
[y, Fs] = audioread(char(filenames {1}));
silence_length = 30; %%[sec]
silence_block = zeros(silence_length * Fs, 1);
pip_length = 0.2; % [s] length of each pip
number_of_pips = 3;
for i = 2:length(filenames)
[y, Fs] = audioread(char(filenames {1}));
frames_to_crop = pip_length * number_of_pips * Fs;
y = y(frames_to_crop+1:end);
concat = [concat; y];
end;
output_file = [loc, '\', 'concat_cond123', '.wav'];
audiowrite(output_file, concat, Fs);
Trying to concatenate 3 .wav files, each with exactly 13:20 in length. However, when I get the resulting 'concat_cond123.wav' file, the total time is only 26:40. (13:20*3 files) should be 39.60 in length, meaning there is about 13:20 of the overall concatenated .wav file that got cut off (could be one of the audio files?)
Still new to MatLab and Concatenating, but any help would be appreciated - thanks.
P.S. I'm getting a warning when I run the task in the Command Window stating:
>> MakeTaskfile
Warning: Integer operands are required for colon operator when used as index
> In MakeTaskfile (line 17)
Warning: Integer operands are required for colon operator when used as index
> In MakeTaskfile (line 17)

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