Mapping between two arrays wrt one column

2017 12 25

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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?

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Star Strider 2017-12-25

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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

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