[petsc-users] KSPSetComputeRHS and KSPSetComputeOperators

[iwaddington .]

HI everybody, I have a doubt concerning how the function KSPSetComputeRHS
works, because according to its prototype one of its arguments is a pointer
to a function that takes a vector object as argument, not a pointer towards
a vector object, so how is it able to set the rhs if the passage of the
vector is done by value and not by reference ?

Another thing is the functioning of KSPSetComputeOperators. I want to set
the linear system matrix and I want the preconditioning matrix to be equal,
so can I just set the linar system matrix in the function that is argument
of KSPSetComputeOperators, or do I need to make a matcopy in it ?
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