[petsc-users] Problems with MatGetRowMinAbs

[Dominik Szczerba]

I am doing something as simple as:

	PetscReal mmin = 0.0;
	Vec vmin = 0;
	PetscInt msize = 0, nsize = 0;
	ierr = MatGetSize(Av, &msize, &nsize); CHKERRQ(ierr);
	ierr = VecCreateMPI(PETSC_COMM_WORLD, PETSC_DECIDE, msize, &vmin);
CHKERRQ(ierr);
	ierr = MatGetRowMinAbs(Av, vmin, PETSC_NULL); CHKERRQ(ierr);

or in words, setting the size for the vector storing min values in
Av's rows to the actual number of rows, and I am surprised to get:

[4]PETSC ERROR: Nonconforming object sizes!
[4]PETSC ERROR: Nonconforming matrix and vector!

pointing to the line with MatGetRowMinAbs. Values in msize and msize
are what they are expected to be, the matrix is assembled. What am I
doing wrong here?

Thanks
Dominik