petsc-3.11.2 2019-05-18
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PetscViewerASCIIOpen

Opens an ASCII file for writing as a PetscViewer.

Synopsis

#include "petscviewer.h"   
PetscErrorCode  PetscViewerASCIIOpen(MPI_Comm comm,const char name[],PetscViewer *lab)
Collective on MPI_Comm

Input Parameters

comm - the communicator
name - the file name

Output Parameter

lab -the PetscViewer to use with the specified file

Notes

To open a ASCII file as a viewer for reading one must use the sequence
    PetscViewerCreate(comm,&lab);
    PetscViewerSetType(lab,PETSCVIEWERASCII);
    PetscViewerFileSetMode(lab,FILE_MODE_READ);
    PetscViewerFileSetName(lab,name);

This PetscViewer can be destroyed with PetscViewerDestroy().

The MPI communicator used here must match that used by the object one is viewing. For example if the Mat was created with a PETSC_COMM_WORLD, then the Viewer must be created with PETSC_COMM_WORLD

As shown below, PetscViewerASCIIOpen() is useful in conjunction with MatView() and VecView()

     PetscViewerASCIIOpen(PETSC_COMM_WORLD,"mat.output",&viewer);
     MatView(matrix,viewer);

See Also

MatView(), VecView(), PetscViewerDestroy(), PetscViewerBinaryOpen(), PetscViewerASCIIRead()
PetscViewerASCIIGetPointer(), PetscViewerPushFormat(), PETSC_VIEWER_STDOUT_, PETSC_VIEWER_STDERR_, PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_STDOUT_SELF,

Level

beginner

Location

src/sys/classes/viewer/impls/ascii/vcreatea.c

Examples

src/ksp/ksp/examples/tutorials/ex54.c.html
src/ksp/ksp/examples/tutorials/ex55.c.html
src/ksp/ksp/examples/tutorials/ex56.c.html
src/ksp/ksp/examples/tutorials/ex72.c.html
src/snes/examples/tutorials/ex15.c.html
src/snes/examples/tutorials/ex48.c.html
src/snes/examples/tutorials/ex70.c.html
src/snes/examples/tutorials/ex1f.F90.html
src/ts/examples/tutorials/ex9.c.html
src/ts/examples/tutorials/ex14.c.html

Index of all Viewer routines
Table of Contents for all manual pages
Index of all manual pages