MATLAB: Adding a number to a vector depending on a different vector

Question

I have a column vector containing only zeros and ones (A) I have another column vector, the same length as A, containing numerous integers (B)

I need to add 128 to the value in B if there is a 1 in A.

so an example of what I need…

A = [ 0 0 0 0 0 1 0 0 0 0 ]';
B = [55 56 54 58 61 60 62 63 61 58]';

In this case, I need to add 128 to the 6th element in B.

How can I automate this please. Thanks

Answer 1

Use a simple multiplication:

B + A*128

or perhaps logical indexing:

B(A==1) = B(A==1)+128