MATLAB: How to find maximum and minimum in a matrix

how to find maximum and minimum in a matrix

I have matrix A with n rows and 2 columns. I would like to find rows which has the maximum and/or minimum of X and/or Y. Then, replace zero in these rows.
For instance: I have matrix A and I would like to produce matrix B.
 A= [0.1 0.5
 0.3 0.9
 0.4 0.8
 0.4 0.2
 1 0.7
 0.2 0.6
 0.7 1
 0.2 0.9]
 Here, max. X=1    min. X=0.1     max. Y=1    min. Y=0.2
 B= [0 0
 0.3 0.9
 0.4 0.8
 0 0
 0 0
 0.2 0.6
 0 0
 0.2 0.9]

Best Answer

A= [0.1 0.5
 0.3 0.9
 0.4 0.8
 0.4 0.2
 1 0.7
 0.2 0.6
 0.7 1
 0.2 0.9]
idx = A(:,1)==max(A(:,1)) | A(:,1)==min(A(:,1)) |...
      A(:,2)==max(A(:,2)) | A(:,2)==min(A(:,2));
A(any(idx,2),:) = 0
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