MATLAB: Changing the boundary rows and columns.

zero columnzero row

I'm having a bit of a problem finding a solution to this most likely due to the answer being relatively simple. I have a matrix of all ones. Let's say,
[1,1,1,1; 1,1,1,1; 1,1,1,1] What I need to do is relatively simple. I need to change the values of the first and last columns and rows to zero such that the matrix would be.
[0,0,0,0; 0,1,1,0; 0,0,0,0]
Is there a way to tell matlab to give a value of zero to every number within a given column or row?

Best Answer

A = [1,1,1,1; 1,1,1,1; 1,1,1,1];
A([1,end],:) = 0;  % Changes the first and last row.
A(:,[1,end]) = 0;  % Changes the first and last column.
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