replacing specific elements in a matrix

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Dear all,
I have a matrix A of dimension 9126 by 2 and I want to replace the elements (39,2) (39*2,2) , (39*3,2), (39*4,2) and so forth by zero
Is there any simple way to do that.
The matrix is of the form A=[ 1 2; 3 4];
thanks

Accepted Answer

Walter Roberson
Walter Roberson on 30 Jun 2012
A(39:39:end,:) = 0;

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