[petsc-users] SNESSetOptionsPrefix usage

[Timothée Nicolas]

Hi, thanks for your answer,

I'm using Petsc version 3.10.4

Timothée

Le mer. 15 janv. 2020 à 14:59, Mark Adams <mfadams at lbl.gov> a écrit :

> I'm guessing a Fortran issue. What version of PETSc are you using?
>
> On Wed, Jan 15, 2020 at 8:36 AM Timothée Nicolas <
> timothee.nicolas at gmail.com> wrote:
>
>> Dear PETSc users,
>>
>> I am confused by the usage of SNESSetOptionsPrefix. I understand this is
>> required if you have for example different SNES in your program and want to
>> set different options for them.
>> So for my second snes I wrote
>>
>> call SNESCreate(MPI_COMM_SELF,snes,ierr)
>>
>> call SNESSetOptionsPrefix(snes,'green_',ierr)
>>
>> call SNESSetFromOptions(snes,ierr)
>>
>> etc.
>>
>> Then when launching the program I wanted to monitor that snes so I
>> launched it with the option -green_snes_monitor instead of -snes_monitor.
>> But I keep getting the message
>>
>> WARNING! There are options you set that were not used!
>>
>> WARNING! could be spelling mistake, etc!
>>
>> Option left: name:-green_snes_monitor (no value)
>>
>> What do I miss here?
>>
>> Best regards
>>
>> Timothée NICOLAS
>>
>
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