I would like to compute the residual A - LU, where LU is the ILU factorization of A. What is the most convenient way of doing so?
> -----Original Message----- > From: owner-petsc-users at mcs.anl.gov > [mailto:owner-petsc-users at mcs.anl.gov] On Behalf Of Matthew Knepley > Sent: Thursday, November 29, 2007 12:04 PM > To: petsc-users at mcs.anl.gov > Subject: Re: PCGetFactoredMatrix > > > It depends on the package, but the petsc stuff stores L and U > in one matrix. > > Matt > > On Nov 29, 2007 9:03 AM, John R. Wicks <jwicks at cs.brown.edu> wrote: > > The documentation for PCGetFactoredMatrix is not clear. What does > > this return for ILU(0), for example? Does it return the > product LU or > > the in place factorization? > > > > > > > > -- > What most experimenters take for granted before they begin > their experiments is infinitely more interesting than any > results to which their experiments lead. > -- Norbert Wiener >
