Hi,
Is there a way to extract a subset of non-contiguous elements of a matrix
elegantly and with 1 or very few scripts?
Suppose I have a matrix of positive and negative numbers (m) and I want to
retrieve only the positive number. This I can do
which(m>0, arr.ind=T) which gives the indices of positive elements like (37,1),
(80,1), ..., (54,2) etc. How can I extract positive numbers without looping on
the indexes provided by which to make a new matrix?
thanks,
Carol
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