[Dune] GMPField use

[Oliver Sander]

Hi Kirill,

so the problem are the calls to storeMatrixMarket?  They are not needed
for the example program to work, and you can simply remove them.

The example program has these calls because later examples in the book
need the Poisson matrix and rhs as MatrixMarket files, and I wanted to
show the readers how to write such files.

Best,
Oliver

On 10.06.21 00:12, Dedner, Andreas wrote:
> Not sure which solver package might work 'out of the box'. The issue you encountered in dune-istl seems quite small -
> I'm not an expert but probably the issue with the missing 'str' can be easily fixed. Perhaps someone with more insight can
> give a hint. Of course there might be more difficult issues later in the code.
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> *From:* Kirill Volyanskiy <vol.kirill at gmail.com>
> *Sent:* 09 June 2021 12:07
> *To:* Dedner, Andreas <A.S.Dedner at warwick.ac.uk>
> *Subject:* Re: [Dune] GMPField use
> Thank you. Could you recommend another solver library compatible with GMPField?
> 
> ср, 9 июн. 2021 г. в 12:54, Dedner, Andreas <A.S.Dedner at warwick.ac.uk <mailto:A.S.Dedner at warwick.ac.uk>>:
> 
>     The issue is that the class
>     `mm_numeric_type` in dune/istl/matrixmarket.hh is overloaded for a number of types, i.e., int/double etc. There is no overload for GMPField and default implementation of the class doesn't have a 'str' method.
>     ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>     *From:* Kirill Volyanskiy <vol.kirill at gmail.com <mailto:vol.kirill at gmail.com>>
>     *Sent:* 09 June 2021 10:17
>     *To:* Dedner, Andreas <A.S.Dedner at warwick.ac.uk <mailto:A.S.Dedner at warwick.ac.uk>>
>     *Subject:* Re: [Dune] GMPField use
>     Hi.
>     Thank you for your reply.
>     I am using DUNE 2.7.1, GMP 6.2.1.
>     I've taken the program from sander-getting-started-with-dune-2-7.pdf and changed some types to GMPField<128> (see in the attached file).
>     The compilation results are in the errors.txt file.
> 
>     Best
>     Kirill
> 
>     ср, 9 июн. 2021 г. в 10:41, Dedner, Andreas <A.S.Dedner at warwick.ac.uk <mailto:A.S.Dedner at warwick.ac.uk>>:
> 
>         Hi.
>         Happy to help but we need a bit more information about what you 
are trying to do.
>         Where are you using the GMPField, perhaps you could provide a bit of code showing the errors or at least attach the errors you are getting. I don't have any idea why a 'str' function would be needed for a 'Field' class.
> 
>         The GMPField has been used in a very specific context so far and I would imaging that using it in for example the istl AMG solver will cause problems with some missing functionality.
>         Best
>         Andreas
>         ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>         *From:* Dune <dune-bounces at lists.dune-project.org <mailto:dune-bounces at lists.dune-project.org>> on behalf of Kirill Volyanskiy <vol.kirill at gmail.com <mailto:vol.kirill at gmail.com>>
>         *Sent:* 08 June 2021 08:39
>         *To:* dune at lists.dune-project.org <mailto:dune at lists.dune-project.org> <dune at lists.dune-project.org <mailto:dune at lists.dune-project.org>>
>         *Subject:* [Dune] GMPField use
>         Hello,
>         Is there any guide on using the GMPField? I've tried to use it but got many errors in some modules like absence of str() function etc.
> 
>         Best regards,
>         Kirill
> 
> 
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