[ublas] How to get a matrix proxy of an index set?

From: Kenny Erleben (kenny_at_[hidden])
Date: 2007-08-26 16:30:02

Hi All,

I am trying to get something like a matrix proxy of a compressed ublas 
matrix corresponding to some index set. The index set is NOT contiguous.

I know that I could use permuations to re-order my matrix and then use a 
matrix range. However, the permutations involve matrix products so it 
seems so in-effective, isn't there some clever way around this?

/Kenny