how to pick element by element
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A = magic(3)
kindly tell me how i can pick one by one element in same matrix A then do some mathematical operation if it satisfies the condition the element is replaced by new value else it remains the same for example mathematical operation is A + 10, if A+10 is >12 replace other wise remain same as initial value,then second then third..........
thanks
回答（1 个）
Why not just use logical indexing:
>> A = magic(3)
A =
8 1 6
3 5 7
4 9 2
>> A(A>3) = 0
A =
0 1 0
3 0 0
0 0 2
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2016-2-5
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