Hi PETSc users,
I'm trying to set my matrix multiplication with MatShellSetOperation.
The question is: is it possible to pass a c++ template function as my matrix
multiplication to MatShellSetOperation?
And if yes, how?
Thanks for any suggestions.
Marco
Hi folks,
On 19 Dec 2014, at 18:29, Lawrence Mitchell lawrence.mitch...@imperial.ac.uk
wrote:
On 19 Dec 2014, at 18:19, Lawrence Mitchell
lawrence.mitch...@imperial.ac.uk wrote:
...
Calling MatGetLocalSubMatrix results in an error:
[0]PETSC ERROR: - Error
Matthew Knepley knep...@gmail.com writes:
Fieldsplit block preconditioners can be used on this type of matrix, but
success obviously depends on the
analytic character of the operators. In particular, if we assume that we
have great PCs for the diagonal,
then B is the most important variable,
On Sat, Jan 10, 2015 at 10:10 AM, Umut Tabak u.ta...@tudelft.nl wrote:
Dear all,
For an eigenvalue solver, I was brainstorming on some ideas to solve some
linear systems of the form:
[A B] x1 = b1
[B C] x2 = b2
Where A and C are symmetric sparse but indefinite matrices due to some
shift
On Mon, Jan 12, 2015 at 7:59 AM, Marco Cisternino
marco.cistern...@optimad.it wrote:
Hi PETSc users,
I'm trying to set my matrix multiplication with MatShellSetOperation.
The question is: is it possible to pass a c++ template function as my
matrix multiplication to MatShellSetOperation?
I'd be interested in implementing this, I think I should have some time to
spend on it in a few weeks. I suppose the ISSubset function should
determine which ISs were used to make up a third IS? Can this be done by
having ISSum attach a list of pointers to the constituent ISs to the summed
IS for
Thanks for the comments Jed and Matt, I'll defer to your judgement
regarding the implementation that is the least intrusive. I'll take a look
at this later on when I have time.
Colin
On Mon, Jan 12, 2015 at 12:29 PM, Jed Brown j...@jedbrown.org wrote:
Matthew Knepley knep...@gmail.com writes:
On 01/12/2015 05:58 PM, Matthew Knepley wrote:
On Mon, Jan 12, 2015 at 10:57 AM, Umut Tabak u.ta...@tudelft.nl
mailto:u.ta...@tudelft.nl wrote:
On 01/12/2015 04:29 PM, Matthew Knepley wrote:
Fieldsplit block preconditioners can be used on this type of
matrix, but success
Umut Tabak u.ta...@tudelft.nl writes:
Thx for the swift reply, well, you mean directly or iteratively? I
looked a bit more but I am not sure if that is possible iteratively or
not, I guess it is not since the character of the blocks on the diagonal
are not well suited to iterative solution
On Mon, Jan 12, 2015 at 11:15 AM, Jed Brown j...@jedbrown.org wrote:
Colin McAuliffe cjm2...@columbia.edu writes:
I'd be interested in implementing this, I think I should have some time
to
spend on it in a few weeks. I suppose the ISSubset function should
determine which ISs were used to
Matthew Knepley knep...@gmail.com writes:
I don't like this business of ISes holding pointers to other ISes. This
fundamentally
changes the model. The hashing sounds workable.
ISs are immutable and a reference would probably be held anyway, so I
don't think it's evil.
We also have to think
On 01/12/2015 04:29 PM, Matthew Knepley wrote:
Fieldsplit block preconditioners can be used on this type of matrix,
but success obviously depends on the
analytic character of the operators. In particular, if we assume that
we have great PCs for the diagonal,
then B is the most important
On Mon, Jan 12, 2015 at 10:57 AM, Umut Tabak u.ta...@tudelft.nl wrote:
On 01/12/2015 04:29 PM, Matthew Knepley wrote:
Fieldsplit block preconditioners can be used on this type of matrix, but
success obviously depends on the
analytic character of the operators. In particular, if we assume
Colin McAuliffe cjm2...@columbia.edu writes:
I'd be interested in implementing this, I think I should have some time to
spend on it in a few weeks. I suppose the ISSubset function should
determine which ISs were used to make up a third IS? Can this be done by
having ISSum attach a list of
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