How do I map array values on a logical array

Hello,

I have a vector with numbers that i need to be remapped on different positions according to a logical bitmap array.

Example:

A = [3 6 8 1 0 -3];

B = [ 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0];

Result = [ 0 0 0 0 0 0 0 0 3 6 8 1 0 -3 0 0 0];

The number of ones in B always matches the length of A but in general length(B)~=length(A)

How can i do that without going through a for loop?

Thanks!

Answer 1

[Steve Eddins]

Use logical indexing.

C = zeros(size(B));
C(logical(B)) = A

[Riccardo Micci]

Thanks it's a very elegant solution!

[Steve Eddins]

In addition to the doc link that provided, see my 28-Jan-2008 blog post on the topic.

Answer 2

[Bruno Luong]

Result = zeros(size(B));
Result(B==1)=A