Re: [GSoC 2017 Application] Improve Iterative Methods for Sparse Linear Systems

[Marco Caliari]

On Wed, 8 Mar 2017, Rui Xie wrote:

> Hi Marco,
> I'm a Chinese undergraduate student and I major in both mathematics and
> electrical engineering. I have used MATLAB a lot in the past two years for
> course projects. I'd like to apply for GSoC this year with Octave and I'm
> interested in the project "Improve iterative methods for sparse linear
> systems".
>
> I have read Cristiano Dorigo's report for his work, and implemented
> an additional method minres in a patch
> at https://savannah.gnu.org/patch/?9282. It is now only a draft. Could you
> give me some suggestions? Thanks.
>
>
> Best regards,
> Rui Xie

Dear Rui Xie,

I suggest you the following. First, apply Cristiano's patch you can find
here

https://savannah.gnu.org/patch/?9108 #39638

Second, add the tests you find in pcg.m to your minres.m. As you know,
minres does not require the matrix to be positive definite. Therefore, add
tests for symmetric and Hermitian matrices NOT positive definite.

Regards,

Marco