select 20 percent between two values

Hi All,

I have a lot of recordings to anlyze, but not enough time to go through the whole of them. Now I would like MATLAB to randomly select 20% of each recording. So what I want in the end is to create a function, that I can set my directory to all the recordings, and than for each 20% percent is randomly selected and put into a new wav. file that I can use for the analyses. I looked at examples of random sampling, but could not find anything like this. Is this possible to do in MATLAB?

Cheers,

Simone

Answer 1

[Adam Danz]

Use y = randsample(n,k) to select k random elements from a vector 1:n.

% recordingList is an array that contains all of your recordings.
randIdx = randsample(numel(recordingList), round(numel(recordingList)*.2));
sample = recordingList(randIdx);