Just make a function that creates viewers like this, then call it to create two independent viewers that are configured similarly except for the file name. I don't think this makes sense in the library.
On Wed, Mar 20, 2013 at 1:28 PM, Nachiket Gokhale <gokhalen at gmail.com>wrote: > I have this in my code: > > ierr = PetscViewerCreate(PETSC_COMM_WORLD,&RightViewer);CHKERRQ(ierr); > ierr = PetscViewerSetType(RightViewer,PETSCVIEWERASCII);CHKERRQ(ierr); > ierr = PetscViewerFileSetMode(RightViewer,FILE_MODE_WRITE);CHKERRQ(ierr); > ierr = > PetscViewerSetFormat(RightViewer,PETSC_VIEWER_ASCII_MATLAB);CHKERRQ(ierr); > > ierr = PetscViewerCreate(PETSC_COMM_WORLD,&LeftViewer);CHKERRQ(ierr); > ierr = PetscViewerSetType(LeftViewer,PETSCVIEWERASCII);CHKERRQ(ierr); > ierr = PetscViewerFileSetMode(LeftViewer,FILE_MODE_WRITE);CHKERRQ(ierr); > ierr = > PetscViewerSetFormat(LeftViewer,PETSC_VIEWER_ASCII_MATLAB);CHKERRQ(ierr); > > It would have been nice to create the LeftViewer from the RightViewer. > That is what I am trying to do. > > At other places I use only one viewer to output left and right matrices: > > // projection matrices in ascii > ierr = PetscViewerCreate(PETSC_COMM_WORLD,&ProjMatViewer);CHKERRQ(ierr); > ierr = PetscViewerSetType(ProjMatViewer,PETSCVIEWERASCII);CHKERRQ(ierr); > ierr = > PetscViewerFileSetMode(ProjMatViewer,FILE_MODE_WRITE);CHKERRQ(ierr); > ierr = > PetscViewerSetFormat(ProjMatViewer,PETSC_VIEWER_ASCII_MATLAB);CHKERRQ(ierr); > // right > ierr = > PetscViewerFileSetName(ProjMatViewer,projfileasciiright);CHKERRQ(ierr); > ierr = MatView(ProjMatRight,ProjMatViewer);CHKERRQ(ierr); > // left > ierr = > PetscViewerFileSetName(ProjMatViewer,projfileasciileft);CHKERRQ(ierr); > ierr = MatView(ProjMatLeft,ProjMatViewer);CHKERRQ(ierr); > // destroy > ierr = PetscViewerDestroy(&ProjMatViewer);CHKERRQ(ierr); > > But I think switching the filename is inconvenient - I'd rather create > a separate viewer Left and Right Matrices and have it copy the same > parameters from an already created viewer. > > -Nachiket > > On Wed, Mar 20, 2013 at 2:16 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > > What would it mean to duplicate a viewer? What are you actually trying to > > do? > > > > On Mar 20, 2013 12:59 PM, "Nachiket Gokhale" <gokhalen at gmail.com> wrote: > >> > >> Not a show stopper, but would it be possible to add a > >> PetscViewerDuplicate function? I don't see such a function here - > >> > >> > http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Viewer/index.html > >> > >> Cheers, -Nachiket > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130320/ac7672b4/attachment.html>
