[petsc-users] MatSetValues: reorder the values

[Hui Zhang]

Current MatSetValues is
MatSetValues(Mat mat,PetscInt m,const PetscInt idxm[],PetscInt n,const PetscInt idxn[],const PetscScalar v[],InsertMode addv)
I want something like
MatSetValues(Mat mat,PetscInt m,const PetscInt idxm[],PetscInt n,const PetscInt idxn[],const PetscScalar v[], const PetscInt idxv[], InsertMode addv)
         -----------------------
         add a new parameter

such that the values v[0..m*n] are first reordered to v[idxv[0..m*n]] before set to the mat.
We may first do permutation on v before passing to current MatSetValues.  But won't the 
new function be easier to use? 

In the case that idxm[], idxn[] are obtained from a certain application ordering
but not the ordering of v[], I think I need the new function.
Of course, this new function sounds unnecessary because reordering v is equivalent to reordering 
idxm[] and idxn[].  But the second method seems not an easy task to me, is it?

Thanks!  



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