[petsc-users] Fortran Interface

[Mark Adams]

yep, that's a cut and paste bug.
"user" is a common name for a user context.

On Tue, Dec 12, 2023 at 11:17 PM Sanjay Govindjee via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> did you mean to write
>
> type (userctx)   ctx
>
> in this example?
>
>
> subroutine func(snes, x, f, ctx, ierr)
> SNES snes
> Vec x,f
> type (userctx)   user
> PetscErrorCode ierr
> ...
>
> external func
> SNESSetFunction(snes, r, func, ctx, ierr)
> SNES snes
> Vec r
> PetscErrorCode ierr
> type (userctx)   user
>
>
>
>
> On Tue, Dec 12, 2023 at 7:10 PM Barry Smith <bsmith at petsc.dev> wrote:
>
>>
>> See
>> https://petsc.gitlab.io/-/petsc/-/jobs/5739238224/artifacts/public/html/manual/fortran.html#ch-fortran
>>  and https://gitlab.com/petsc/petsc/-/merge_requests/7114
>>
>>
>>
>> On Dec 12, 2023, at 3:22 PM, Palmer, Bruce J via petsc-users <
>> petsc-users at mcs.anl.gov> wrote:
>>
>> What do you do with something like a void pointer? I’m looking at the
>> TaoSetObjectiveAndGradient function and it wants to pass a void *ctx
>> pointer. You can set this to null, but apparently you have to specify the
>> type. What type should I use? Is there something called PETSC_NULL_VOID or
>> PETSC_NULL_CONTEXT or do I use something else?
>>
>>
>> *From: *Matthew Knepley <knepley at gmail.com>
>> *Date: *Tuesday, December 12, 2023 at 8:33 AM
>> *To: *Palmer, Bruce J <Bruce.Palmer at pnnl.gov>
>> *Cc: *petsc-users at mcs.anl.gov <petsc-users at mcs.anl.gov>
>> *Subject: *Re: [petsc-users] Fortran Interface
>> Check twice before you click! This email originated from outside PNNL.
>>
>> On Tue, Dec 12, 2023 at 11:27 AM Palmer, Bruce J via petsc-users <
>> petsc-users at mcs.anl.gov> wrote:
>>
>> Does documentation for the PETSc fortran interface still exist? I looked
>> at the web pages for 3.20 (petsc.org/release) but if you go under the
>> tab C/Fortran API, only descriptions for the C interface are there.
>>
>>
>> I think after the most recent changes, the interface was supposed to be
>> very close to C, so we just document the differences on specific pages, and
>> put the general stuff here:
>>
>>   https://petsc.org/release/manual/fortran/
>>
>>    Thanks,
>>
>>      Matt
>>
>>
>> Bruce Palmer
>>
>>
>>
>> --
>> What most experimenters take for granted before they begin their
>> experiments is infinitely more interesting than any results to which their
>> experiments lead.
>> -- Norbert Wiener
>>
>> https://www.cse.buffalo.edu/~knepley/
>> <http://www.cse.buffalo.edu/~knepley/>
>>
>>
>>
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