How to index variables from column B based on column A condtion

I have an array of variables with 2 columns.

A containing input and B containing output.

looks something like this

A=[ 200;200;200...;400;400;...;600;600]

B[5.5;6.5;6.0...;8.5;9.6;....;14.3;18.4]

how do i index the values in column B into seperate arrays based on column A values?

im sure it involves logical indexing just not sure the procedure

Answer 1

[Cris LaPierre]

Logical indexing and assignment

A = [1 2];
B = [3 4];

% assign results to new variables
C = B(A==1)

C = 3

D = B(A==2)

D = 4