[petsc-users] matrix with complex number

Yujie recrusader at gmail.com
Fri Jan 22 14:43:00 CST 2010

Dear Barry,

What are the difficult things if PETSc is revised with matrices of complex
and real numbers? It should be more flexible for a general scientific
toolbox. I am curious almost all the packages don't support both
simultaneously. Thanks a lot.


On Fri, Jan 22, 2010 at 2:35 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>   The way we handle complex numbered linear systems in PETSc is to compile
> all of PETSc with complex numbers and then just use the solvers on those
> complex numbers. The current drawback to this is that PETSc can only be
> built with support for complex numbers or for real numbers. We cannot build
> a PETSc where some matrices are complex and some are real.
> We don't have any interest in solving complex systems as larger real
> systems.
>   Barry
> On Jan 22, 2010, at 11:04 AM, Yujie wrote:
>  Dear PETSc Developers,
>> Recently, I am trying to find some complex number-based solvers and
>> preconditioners. However, it is difficult to find a general framework to
>> include some solvers and preconditioners. Trilinos is developing a package,
>> komplex, to use the real-number-based solver to solve complex number -based
>> problem. I don't know whether PETSc wants to develop such the function for
>> complex number-based problem. I think it will significantly increase the
>> application range of PETSc. After all, in PETSc, lots of solvers and
>> preconditioners have been developed. Thanks  a lot.
>> Regards,
>> Yujie
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