DOLFIN

Assembled matrix

Asked by Dupront

Hello,

Do we have to specify in the command file if the
assembled matrix is symmetric in order to use the
best iterative linear solver ?
The symmetry of the matrix cannot be determined internally ?

Thanks

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Anders Logg (logg) said : 		#1

On Tue, Feb 28, 2012 at 02:50:55PM -0000, Dupront wrote:
> New question #189104 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/189104
>
> Hello,
>
> Do we have to specify in the command file if the
> assembled matrix is symmetric in order to use the
> best iterative linear solver ?
> The symmetry of the matrix cannot be determined internally ?

There is no check for symmetry. You need to set the solver parameter
"symmetric":

solver.parameters["symmetric"] = True

--
Anders

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Dupront (michel-dupront) said : 		#2

I will do that.

Thank you very much.