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Replace values in matrix

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Volkan Yangin
Volkan Yangin 2017-3-6
编辑： Volkan Yangin 2017-3-6
Hi everybody I have a matrix, for ex: A=[2 5 7 12 9 4] and another matrix B=[1 4]
ı want to replace elements apart from 1. and 4. as "NaN". (2., 3., 5., and 6., element must be equal to NaN) I tried if command, but i took an error. Is there any pratical command for this operation? Thanks.

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Stephen23
Stephen23 2017-3-6
>> A = [2,5,7,12,9,4];
>> B = [1,4];
>> A(~ismember(1:numel(A),B)) = NaN
A =
2 NaN NaN 12 NaN NaN

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