petsc-3.6.2 2015-10-02
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# VecView

Views a vector object.

### Synopsis

    #include "petscvec.h"
    PetscErrorCode  VecView(Vec vec,PetscViewer viewer)

Collective on Vec

### Input Parameters

| vec | - the vector
| viewer | - an optional visualization context

### Notes

The available visualization contexts include

| PETSC_VIEWER_STDOUT_SELF | - for sequential vectors
| PETSC_VIEWER_STDOUT_WORLD | - for parallel vectors created on PETSC_COMM_WORLD
| PETSC_VIEWER_STDOUT_(comm) | - for parallel vectors created on MPI communicator comm

You can change the format the vector is printed using the option PetscViewerSetFormat().

The user can open alternative visualization contexts with

| PetscViewerASCIIOpen() | - Outputs vector to a specified file
| PetscViewerBinaryOpen() | - Outputs vector in binary to a specified file; corresponding input uses VecLoad()
| PetscViewerDrawOpen() | - Outputs vector to an X window display
| PetscViewerSocketOpen() | - Outputs vector to Socket viewer

The user can call PetscViewerSetFormat() to specify the output format of ASCII printed objects (when using PETSC_VIEWER_STDOUT_SELF, PETSC_VIEWER_STDOUT_WORLD and PetscViewerASCIIOpen). Available formats include

| PETSC_VIEWER_DEFAULT | - default, prints vector contents
| PETSC_VIEWER_ASCII_MATLAB | - prints vector contents in MATLAB format
| PETSC_VIEWER_ASCII_INDEX | - prints vector contents, including indices of vector elements
| PETSC_VIEWER_ASCII_COMMON | - prints vector contents, using a format common among all vector types

Notes: You can pass any number of vector objects, or other PETSc objects to the same viewer.

Notes for binary viewer: If you pass multiply vectors to a binary viewer you can read them back in in the same order

        with VecLoad().

       If the blocksize of the vector is greater than one then you must provide a unique prefix to

       the vector with PetscObjectSetOptionsPrefix((PetscObject)vec,"uniqueprefix"); BEFORE calling VecView() on the

       vector to be stored and then set that same unique prefix on the vector that you pass to VecLoad(). The blocksize

       information is stored in an ASCII file with the same name as the binary file plus a ".info" appended to the

       filename. If you copy the binary file, make sure you copy the associated .info file with it.

Notes for HDF5 Viewer: the name of the Vec (given with PetscObjectSetName() is the name that is used

       for the object in the HDF5 file. If you wish to store the same vector to the HDF5 viewer (with different values,

       obviously) several times, you must change its name each time before calling the VecView(). The name you use

       here should equal the name that you use in the Vec object that you use with VecLoad().

See the manual page for VecLoad() on the exact format the binary viewer stores the values in the file.

### See Also

PetscViewerASCIIOpen(), PetscViewerDrawOpen(), PetscDrawLGCreate(),
PetscViewerSocketOpen(), PetscViewerBinaryOpen(), VecLoad(), PetscViewerCreate(), PetscRealView(), PetscScalarView(), PetscIntView()

Level:beginner
Location:src/vec/vec/interface/vector.c
Index of all Vec routines
Table of Contents for all manual pages
Index of all manual pages

### Examples

src/vec/vec/examples/tutorials/ex2.c.html
src/vec/vec/examples/tutorials/ex3.c.html
src/vec/vec/examples/tutorials/ex5.c.html
src/vec/vec/examples/tutorials/ex6.c.html
src/vec/vec/examples/tutorials/ex7.c.html
src/vec/vec/examples/tutorials/ex8.c.html
src/vec/vec/examples/tutorials/ex10.c.html
src/vec/vec/examples/tutorials/ex12.c.html
src/vec/vec/examples/tutorials/ex15.c.html
src/vec/vec/examples/tutorials/ex16.c.html
src/vec/vec/examples/tutorials/ex19.c.html