cannot create mat file.
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More Answers (2)
Walter Roberson on 4 May 2016
save() is not defined to override your choice of file extensions. If a file already has an extension, then save() will use that extension. So what you are doing is overwriting your .wav file with the mat contents.
If you want to change the extension, then use fileparts to extract the file name without the extension; when there is no extension, .mat will be added.