To pad a vector, i.e., copy a vector to a new one, I have to call VecSetValue(newb,1,&idx,...) for each element. But to be efficient, what I really needs is to set a block of values in one call. It looks PETSc does not have a routine for that(?). I looked at VecSetValuesBlocked, but it looks it is not for that purpose.

Should we have something like VecSetValuesBlock(Vec v,PetscInt i,PetscInt cnt,PetscScalar *value, InsertMode mode) to set cnt values starting at index i?

--Junchao Zhang