random sort

[Mike Miller]

I don't know why I can't figure this out!  I'd swear I've done it before.
What's the trick to sorting columns in random order?  I have a matrix with
many columns.  Suppose the matrix is called 'X'.  It seems like I should
be able to use something like this:

[S, I] = sort(rand(size(X)));

Then I can use 'I' to sort the columns of X, right?  But how?  I just know
there's an easy trick.

Thanks in advance for breaking my mental block.

Mike



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