Indexing matrix from array

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

Answer 1

[David Hill]

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

[Inna Pelloso]

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