[petsc-users] Question regadring VecScatter

[Bisht, Gautam]

Hi,

I'm getting an error while creating a VecScatter for a MPI vector to another MPI vector.

'vec_from' has 3 elements (1 on proc-0 and 2 on proc-1)
'vec_to' has 3 elements (2 on proc-0 and 1 on proc-1)

I want to scatter forward elements of 'vec_from' to 'vec_to' and am using IS to create the VecScatterCreate. Attached is the code.

mpiexec -n 2 ./vecscatter_test
produces
[0]PETSC ERROR: --------------------- Error Message ------------------------------------
[0]PETSC ERROR: Nonconforming object sizes!
[0]PETSC ERROR: Local scatter sizes don't match!
[0]PETSC ERROR: ------------------------------------------------------------------------
Any ideas what's going wrong?

Thanks,
-Gautam.
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