change a logical array value based on the index of another matrix

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raheem mian
raheem mian 2019-11-10
评论： raheem mian 2019-11-10
I have a logical matrix the same size as matrix A.
If A has a value above a threshold, I want to change the corresponding index in the logical matrix to 1.
A = [1 2 3 4 5];
x = [0 0 0 0 0];
%based on A >= 4 change x to 1 ;
%so x would be [0 0 0 1 1]

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John D'Errico
John D'Errico 2019-11-10
If you want to create x on the fly, then just do this:
x = A > 4;
If you for some reason really want to modify an existing vector x, then do this:
x(A > 4) = true;

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