Indexing matrix from array

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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!

David Hill 2022-3-25

A = [1:3; 4:6; 7:9];
B = logical([1;0;1]);
C=A(B,:);

Inna Pelloso 2022-3-25

Thank you! I forgot to format the index as logical!

MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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