On Thu, Mar 24, 2011 at 08:25, Kontsantinos Kontzialis < ckontzialis at lycos.com> wrote:
> Dear all, > > I'm using the following function: > > ierr = MatMFFDGetH(sys.J, &h); > CHKERRQ(ierr); > > to get the parameter h in the formula for the jacobian-vector product, but > it returns a value of 0. But how can that be, otherwise a division by zero > would result. > "Gets the last value that was used as the differencing parameter." http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Mat/MatMFFDGetH.html Sounds like you haven't done a multiply yet. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110324/e3767417/attachment.htm>
