combined sorting

For ex;I have an array A=[1:4] and B=[12:19:2:20].If I sort B in descending order B=[20 19 12 2].I want the corresponding positions in A to be swapped as well...ie A=[4 2 1 3].How do I achieve that?

Answer 1

[Matt Tearle]

[sortB,idx] = sort(B,'descend');
sortA = A(idx);

Or put the vectors into a matrix and use sortrows.

[Anand Anand]

thanks a lot Matt..I was actually writing a very long algorithm.-:)

[Matt Tearle]

In MATLAB, that's generally a sign you're doing it wrong! :)