
Ublas : 
From: dariomt_at_[hidden]
Date: 20071123 11:02:18
>> Anyone can explain a bit about permutation_matrix class in lu.hpp,
>> please. I assume that it stores value i at position i.
>the permutation class in lu.hpp is actually a "swaplist" as produced by
>the LU factorization with pivoting algorithm. By default it is
>initialized as the identity permutation. Please refer to the swap_rows
>functions in lu.hpp for an example how to use such a permutation.
OK, I was confused because all functions had a const permutation_matrix
passed as parameter.
Didn´t check the template functions that can modify it.
>>Current version has an inconvenience: I would need a resize() method to
reuse (when possible)
>>the underlying memory of its vector base class.
Reusing the underlying memory is still a requirement for me. Any ideas on
why isn't that possible?