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Indexing problem - how to obtain row and column and use later

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Bran
Bran 2013-6-25
If I have a matrix A = [ 1 2 3; 2 3 4; 2 0 8; 4 8 0; 1 2 0; 0 0 0] and I wanted to store the places where the zeros exist and then use this later to form a new matrix B which equals A but all the zero values are replaced with 4, how would I do this?

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Iain
Iain 2013-6-25
whereAequalszero = A ==0;
B = A;
B(whereAequalszero) = 4;

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