Mapping between two arrays wrt one column

I have two matrices: A=[1 10; 2 20; 3 30] and B=[3 1 2]'

I want this to be my final answer A=[3 30;1 10;2 20] How do I do this?

Answer 1

[Star Strider]

Use ‘B’ to define the rows of ‘A’:

A=[1 10; 2 20; 3 30]; 
B=[3 1 2]';

Anew = A(B,:)

Anew =
     3    30
     1    10
     2    20