Andrew,
These are outdated manual pages; you'll want to avoid this.
Jed and Emil have done a major update of the TS interface and solvers, much
more powerful and less confusing.
Likely you'll want to use TSSetIFunction() and TSSetIJacobian()
http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/TS/index.html and work
with petsc-dev http://www.mcs.anl.gov/petsc/developers/index.html
Barry
On Mar 29, 2012, at 8:09 PM, Andrew Spott wrote:
> In the Petsc manual, there is a TSSetMatrices function, however there is no
> further documentation for it.
>
> It is referenced in the manual as:
>
> TSSetMatrices(TS ts,
> Mat A,PetscErrorCode (*frhs)(TS,PetscReal,Mat*,Mat*,MatStructure*,void*), Mat
> B,PetscErrorCode (*flhs)(TS,PetscReal,Mat*,Mat*,MatStructure*,void*),
> MatStructure flag,void *ctx)
>
> However, what is passed to the function pointers isn't mentioned anywhere,
> and it isn't in the online documentation.
>
> Also, I assume that "MatStructure flag" tells if the structure of A and B are
> the same or different, if B is PETSC_NULL, is flag "SAME_NONZERO_PATERN" or
> is it different? (B can be considered to not exist, or to exist as an
> identity matrix, hence the confusion).
>
> How does the ctx work? Is the same context passed to frhs each time?
>
> Thanks for the help.
>
> -Andrew
