Pierre,
There is no rational, we will fix it.
Barry
> On Dec 12, 2014, at 11:47 AM, Pierre Jolivet <[email protected]> wrote:
>
> Hello,
> Taking
> http://www.mcs.anl.gov/petsc/petsc-current/src/vec/vec/examples/tutorials/ex2.c.html
> and changing its 56th line from
> VecSetValues(x,1,&i,&one,ADD_VALUES);
> to
> VecSetValues(x,0,NULL,NULL,ADD_VALUES);
> yield the following error (at least --with-debug=1):
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Invalid pointer
> [0]PETSC ERROR: Null Pointer: Parameter # 3
>
> What is the rationale behind first checking the pointers, then doing the work
> or lack thereof, instead of, first checking if there is some work to do, and
> only then check the pointers (à la MPI) ?
>
> Thank you for your help,
> Pierre
