How can I cancel ("NaN" value) elements of a matrix based on another matrix's "NaN" values?

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André Gadêlha
André Gadêlha 2017-9-25
评论： Stephen23 2017-9-25
Hi everyone,
Let's suppose I have a matrix A: A = 1 2 3; 4 5 6; 7 8 9
and a matrix B: B= 1 NaN 3; NaN 5 6; 7 NaN NaN
I want to cancel the same elements that are canceled in matrix B. It would be:
A2= 1 NaN 3; NaN 5 6; 7 NaN NaN
How can I do that?

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回答（2 个）

OCDER
OCDER 2017-9-25
Use isnan to find where NaN values are. Then replace elements in A with NaN to get A2.
A2 = A;
A2(isnan(B)) = NaN;
A2 =
1 NaN 3
NaN 5 6
7 NaN NaN
Andrei Bobrov
Andrei Bobrov 2017-9-25
A2 = B./B.*A

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