On Jan 22, 2008 8:50 PM, Yujie <recrusader at gmail.com> wrote: > Hi everyone: > > #include "petsc.h" > PetscErrorCode PetscViewerASCIIOpen(MPI_Comm comm,const char > name[],PetscViewer *lab) > > #include "petsc.h" > PetscErrorCode PetscViewerBinaryOpen(MPI_Comm comm,const char > name[],PetscFileMode type,PetscViewer *binv) > > if the difference between them is that one for ASCII output and the other > for Binary output, why are there different parameters?
It is historical. If you want to be generic, you should use PetscViewerCreate() PetscViewerSetType() PetscViewerFileSetMode() PetscViewerFileSetName() which can create both. > The speed to output matrix is very fast when I use PetscViewerBinaryOpen. > However, when I use PetscViewerASCIIOpen, I can't get the matrix output. the > code always is running and it has taken about one day! what's the problem? > thank you. ASCII files do not make sense for large matrices. You should use binary files. Matt > Regards, > Yujie > > > -- 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
