[petsc-users] Fortran Interface

[Sanjay Govindjee]

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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