How to copy or transfer a portion of matrix to another at same location?

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mathango
mathango 2016-5-11
回答： Fangjun Jiang 2016-5-11
Hi, Is there a way to copy or transfer a portion of matrix A (nonzero values) to another matrix B at same location?
for example:
A = [ 0 0 0 0 0; 0 1 0 1 0; 0 1 0 1 0; 0 0 0 0 0 ];
B = [ 8 8 8 8 8; 8 8 8 8 8; 3 3 3 3 3; 2 2 2 2 2 ];
% desired answer is
C = [ 8 8 8 8 8; 8 1 8 1 8; 3 1 3 1 3; 2 2 2 2 2 ];

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2016-5-11
index=A~=0;
C=B;
C(index)=A(index);

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