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<TITLE>DMGetGlobalVector</TITLE>
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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/DM/DMGetGlobalVector.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMGetGlobalVector"><H1>DMGetGlobalVector</H1></A>
Gets a PETSc vector that may be used with the <A HREF="../DM/DM.html#DM">DM</A> global routines.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DM/DMGetGlobalVector.html#DMGetGlobalVector">DMGetGlobalVector</A>(<A HREF="../DM/DM.html#DM">DM</A> dm,<A HREF="../Vec/Vec.html#Vec">Vec</A> *g)
</PRE>
Collective on dm
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm </B></TD><TD>- the dm
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>g </B></TD><TD>- the global vector
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
The vector values are NOT initialized and may have garbage in them, so you may need
to zero them.
<P>
The output parameter, g, is a regular PETSc vector that should be returned with
<A HREF="../DM/DMRestoreGlobalVector.html#DMRestoreGlobalVector">DMRestoreGlobalVector</A>() DO NOT call <A HREF="../Vec/VecDestroy.html#VecDestroy">VecDestroy</A>() on it.
<P>
This is intended to be used for vectors you need for a short time, like within a single function call.
For vectors that you intend to keep around (for example in a C struct) or pass around large parts of your
code you should use <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>().
<P>
VecStride*() operations can be useful when using <A HREF="../DM/DM.html#DM">DM</A> with dof > 1
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>(), <A HREF="../Vec/VecDuplicate.html#VecDuplicate">VecDuplicate</A>(), <A HREF="../Vec/VecDuplicateVecs.html#VecDuplicateVecs">VecDuplicateVecs</A>(),
<BR><A HREF="../DMDA/DMDACreate1d.html#DMDACreate1d">DMDACreate1d</A>(), <A HREF="../DMDA/DMDACreate2d.html#DMDACreate2d">DMDACreate2d</A>(), <A HREF="../DMDA/DMDACreate3d.html#DMDACreate3d">DMDACreate3d</A>(), <A HREF="../DM/DMGlobalToLocalBegin.html#DMGlobalToLocalBegin">DMGlobalToLocalBegin</A>(),
<A HREF="../DM/DMGlobalToLocalEnd.html#DMGlobalToLocalEnd">DMGlobalToLocalEnd</A>(), <A HREF="../DM/DMLocalToGlobalBegin.html#DMLocalToGlobalBegin">DMLocalToGlobalBegin</A>(), <A HREF="../DM/DMCreateLocalVector.html#DMCreateLocalVector">DMCreateLocalVector</A>(), <A HREF="../DM/DMRestoreLocalVector.html#DMRestoreLocalVector">DMRestoreLocalVector</A>()
<A HREF="../Vec/VecStrideMax.html#VecStrideMax">VecStrideMax</A>(), <A HREF="../Vec/VecStrideMin.html#VecStrideMin">VecStrideMin</A>(), <A HREF="../Vec/VecStrideNorm.html#VecStrideNorm">VecStrideNorm</A>()
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>beginner<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/interface/dmget.c.html#DMGetGlobalVector">src/dm/interface/dmget.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/impls/plex/tutorials/ex1.c.html">src/dm/impls/plex/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/dm/impls/plex/tutorials/ex7.c.html">src/dm/impls/plex/tutorials/ex7.c.html</A><BR>
<A HREF="../../../src/dm/impls/plex/tutorials/ex1f90.F90.html">src/dm/impls/plex/tutorials/ex1f90.F90.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex1.c.html">src/dm/impls/stag/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex2.c.html">src/dm/impls/stag/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex3.c.html">src/dm/impls/stag/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/dm/tutorials/ex12.c.html">src/dm/tutorials/ex12.c.html</A><BR>
<A HREF="../../../src/dm/tutorials/ex51.c.html">src/dm/tutorials/ex51.c.html</A><BR>
<A HREF="../../../src/dm/tutorials/ex11f90.F90.html">src/dm/tutorials/ex11f90.F90.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex73.c.html">src/ksp/ksp/tutorials/ex73.c.html</A><BR>
<A HREF="../../../src/snes/tutorials/ex12.c.html">src/snes/tutorials/ex12.c.html</A><BR>
<BR><A HREF="./index.html">Index of all DM routines</A>
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