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matrix comparison and substitute value

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Nafila Farheen
Nafila Farheen 2019-11-6
回答： Walter Roberson 2019-11-6
Hi, I have one matrix
A=[4 2 3
9 5 6]
I have another vector b=[1 0]. I want to compare the first column of A with b, and if the position in A correspondes to a 1 in b, then I would like to replace that value (4 multiply 0.99) and if 0, it will keep as it is . I was wondering is there any way to do that without executing nested for loops?TIA

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Walter Roberson
Walter Roberson 2019-11-6
A = A * (1 - 0.01 * (repmat(b.', 1, size(A,2)) == 1))

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