Replace non-zero elements in array with output of a calculation on them

2019 1 16
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更新时间：2020 10 11
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Hi,
I have an array, A = [2 3 0 7 0 0 9].
How can I replace the non-zero elements of A with thier original value minus one?
I want to generate B = [ 1 2 0 6 0 0 8]
Any help would be appreciated! Thanks,
DB

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Walter Roberson
Walter Roberson 2019-1-16

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mask = A~=0;
A(mask) = A(mask) - 1;
You can code it as a single expression, but that risks evaluating the comparison twice:
A(A~=0) = A(A~=0) - 1;

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