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

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dan berkowitz 2019-1-16

评论： Pedapudi Bharath Raja Bhoopal 2020-10-11

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,

Walter Roberson 2019-1-16

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;

dan berkowitz 2019-1-17

Thank you! I was actually making the error of evaluating the comparison twice!

Thank you

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