Indexing matrix from array

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Inna Pelloso
Inna Pelloso 2022-3-25
评论： Inna Pelloso 2022-3-25
Hi,
I have A = [1:3; 4:6; 7:9] and an index B = [1;0;1].
How can I extract from each column of A the values at are equal to 1 in B?
I want C = [1:3;7:9]. (I am trying to avoid having to use repmat for B)
Thank you!
IP

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David Hill
David Hill 2022-3-25
A = [1:3; 4:6; 7:9];
B = logical([1;0;1]);
C=A(B,:);

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