def initialize_schur_ksp_obj(matrix_A, schur_approx):
"""
Creates a right-hand-side and solution PETSc4Py vector for
testing ksp solves.
Parameters
----------
matrix_A: :class:`p4pyPETSc.Mat`
Global matrix object.
schur_approx: :class:`LS.SchurPrecon`
Returns
-------
ksp_obj: :class:`p4pyPETSc.KSP`
"""
ksp_obj = p4pyPETSc.KSP().create()
ksp_obj.setOperators(matrix_A, matrix_A)
pc = schur_approx.pc
ksp_obj.setPC(pc)
ksp_obj.setFromOptions()
pc.setFromOptions()
pc.setOperators(matrix_A, matrix_A)
pc.setUp()
schur_approx.setUp(ksp_obj)
ksp_obj.setUp()
ksp_obj.pc.setUp()
return ksp_obj
def initialize_asm_ksp_obj(matrix_A):
"""
Creates a right-hand-side and solution PETSc4Py vector for
testing ksp solves.
Parameters
----------
matrix_A: :class:`p4pyPETSc.Mat`
Global matrix object.
Returns
-------
ksp_obj: :class:`p4pyPETSc.KSP`
"""
ksp_obj = p4pyPETSc.KSP().create()
ksp_obj.setOperators(matrix_A, matrix_A)
ksp_obj.setFromOptions()
ksp_obj.setUp()
return ksp_obj