Assign values of array to indices of another array

Hello!

I'm not really sure how to word my question (hence the confusing title!). I do have to arrays:

A = [1,2;3,4];
B = [11;22;33;44];

Now I would like to arrange the elements of B in the order of array A. The output should then be like that:

B(A) = [11,22;33,44]

But now I wanna leave some places of the array 0. So at position A(1,1) where there is a zero shouldn't be a vallue of B asignd to (B(1,1) therefore should stay 0 as well).

A = [0,2;3;4];
B(A) = [0,22;33;44]

Thank you!

[James Tursa]

Need more details. Is the indexing in A always in that order, except for some of the spots might be 0? Or could the indexing be in a different order such as A = [2,0;4,3]?

Answer 1

[Chunru]

A = [1; 2; 3; 4];
B = [11; 22; 33; 44];
B(A) 

ans = 4×1

11 22 33 44

A = [0; 2; 3; 4];
C = zeros(size(A));

C(A>0) = B(A(A>0))

C = 4×1

0 22 33 44

[Georg Bauer]

Awesome thank you!