On 05/24/2018 11:34 PM, zeng wrote:
Actually I want to solve an equation as: A^T x = b. I already know A, how
should I get its transpose?
I note that there is a member function of SparseDirectUMFPACK solver:
void Tvmult (Vector<double>& dst, const Vector<double>& src),
which can fulfil my purpose, sincethis function multiplies with A^{-T}, i.e.
it returns an approximate solution of /A^Tx = b./
/
/
/But what if I want to use a gmres solver? I didn't find in the manual such a
function to get the transpose of a sparse matrix. can someone help me out?
Many thanks!/
In addition to Bruno's solution, there is also the following function:
http://dealii.org/9.0.0/doxygen/deal.II/group__LAOperators.html#ga6bdc65fb2db56230e6bc7d545e81295d
This makes use of the LinearOperator framework:
http://dealii.org/9.0.0/doxygen/deal.II/classLinearOperator.html
http://dealii.org/9.0.0/doxygen/deal.II/group__LAOperators.html
Best
W.
--
------------------------------------------------------------------------
Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
--
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see
https://groups.google.com/d/forum/dealii?hl=en
---
You received this message because you are subscribed to the Google Groups "deal.II User Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
