how to multiply certain numbers in a matrice

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Apple
Apple 2017-2-8
编辑： Stephen23 2017-2-8
if have a matrice A=[1,5,4;3,1,5;6,3,1] But I want to multiply only certain numbers for example A=[2,5,4;3,2,5;6,3,2] how do i do this.

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回答（2 个）

Guillaume
Guillaume 2017-2-8
You haven't explain what certain numbers mean. At a guess:
A(A == 1) = A(A == 1) * 2;
Stephen23
Stephen23 2017-2-8
编辑：Stephen23 2017-2-8
"certain numbers" == numbers along the diagonal ?
>> A = [1,5,4;3,1,5;6,3,1]
A =
1 5 4
3 1 5
6 3 1
>> idx = 1==eye(3);
>> A(idx) = A(idx)*2
A =
2 5 4
3 2 5
6 3 2

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