[petsc-dev] Adding VecErrorNormWRMS()

[Lisandro Dalcin]

Jed, I would like to make the following changes:

*Add PetscErrorCode VecErrorNormWRMS(Vec U,Vec Y,PetscReal atol,Vec
vatol,PetscReal rtol,Vec vrtol,PetscReal *norm).

Any alternative name to suggest?

* Implement TSErrorNormWRMS() in terms of VecErrorNormWRMS().

PS: These changes are preliminary ones, next I want to suggest a
mechanism to let TS subtypes to decide how to compute the LTE error
(or approximation to it).


-- 
Lisandro Dalcin
============
Research Scientist
Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
Numerical Porous Media Center (NumPor)
King Abdullah University of Science and Technology (KAUST)
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