Picking indices randomly

2012 5 11

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Suppose I have a binary vector B of size n. I'd like to randomly pick the indices with value 1. How would one go about doing this?

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Sean de Wolski 2012-5-11

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idx1 = find(A==1);
idxkeep = randperm(numel(idx1),how_many_you_want);
idx12keep = idx1(idxkeep);

Walter Roberson 2012-5-11

Note: this requires R2011b or later (I think it is). Before that,

idx1 find(A==1);

idxkeep = randperm(numel(idx1));

idx12keep = idx1(idxkeep(1:how_many_you_want));

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