use sprintf with .wav files in for-loop

Hi,

How do i properly recall a .wav file in a for-loop? Changing the name of the variable with sprintf gives me an error.

[wav1,Fs] = audioread('wav1.wav');
[wav2,Fs] = audioread('wav2.wav');
[wav3,Fs] = audioread('wav3.wav');

n = 3;
for k = 1:n

          wavx = sprintf('wav%d', k);

          [acor,lag] = xcorr(wav1,wavx);

end

I hope someone can help me, thanks a lot in advance!

[Von Duesenberg]

I wouldn't do this if I were you. The easiest solution I think if your files have the same number of samples would be to import them directly into a matrix and then you can loop through the columns of the matrix.

[harrie houthakker]

allright, unfortunately they do not have the same amount of samples. But if so, (maybe with zeropadding), would that be any useful when my goal is to align them with xcorr? thanks

[Von Duesenberg]

In this case you may want to store the your signals in a cell array and then loop through your cell array. And xcorr does the padding for you.

Answer 1

[Von Duesenberg]

Or, assuming this is for the same piece of homework as yesterday, this can help you (although I hesitate to suggest it as an answer as it does not answer your question):

myFiles = uigetfile('*.wav', 'MultiSelect', 'on');
mySignals = cell(length(myFiles),1);

for iFile = 1:length(myFiles)
    mySignals{iFile} = audioread(char(myFiles(iFile)));
end

[harrie houthakker]

Thank you so much.

Answer 2

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[harrie houthakker]

i came across this earlier indeed, but i find it difficult to find a better solution for my problem. Because my goal is to align the .wav files with xcorr.

[Jan]

@harrie: The application of xcorr is not a problem in any way, if you use a cell array. wav{1} is much better than wav1, because you can access it easily in a loop.