Hi,
I'm wondering how I can easily construct the index vector associated
with a permutation matrix. Here's an example:
<hansl>
pvec = {3,1,2} # given index vector
matrix P = I(nelem(pvec))[pvec,] # associated permutation matrix
matrix PT = I(nelem(pvec))[,pvec] # transpose of that
wanted = {2,3,1} # associated with PT, how ??
</hansl>
Now, a verbose loop-based solution is quite obvious. But is there a
trick to construct the wanted index vector concisely and also for higher
dimensions, of course?
thanks
sven
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