Threshold the matrix with vector

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Aravin
Aravin on 8 Oct 2012
Let say I have a matrix M with m x n dimensions. I want to threshold each column by different threshold. let say N contains the threshold for each column, therefore the dimension of N is n x 1 or 1 x n.
how can I do this by single command.

Accepted Answer

Junaid
Junaid on 8 Oct 2012
One possible way is ..
lets us assume that N is 1 x n vector
N = repmat(N,size(M,1),1);
M_binary = M > N;
or
M_binary = M < N;

More Answers (1)

Wayne King
Wayne King on 8 Oct 2012
Edited: Wayne King on 8 Oct 2012
A = randn(5,3);
n = [0.5 0.8 0.2];
thresh = bsxfun(@gt,A,n);
B = A.*thresh;
B contains nonzero elements only where elements in A exceed the thresholds in the vector n.
  2 Comments
Aravin
Aravin on 8 Oct 2012
Thanks Wayne, but it is not giving me 0 1 matrix as after thresholding B should be binary ???
Wayne King
Wayne King on 8 Oct 2012
thresh is the 0 1 matrix just as I describe above

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