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<TITLE>DMDAGetElements</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/DMDA/DMDAGetElements.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMDAGetElements"><H1>DMDAGetElements</H1></A>
Gets an array containing the indices (in local coordinates) of all the local elements
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMDA/DMDAGetElements.html#DMDAGetElements">DMDAGetElements</A>(<A HREF="../DM/DM.html#DM">DM</A> dm,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *nel,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *nen,const <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *e[])
</PRE>
Not Collective
<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 <A HREF="../DM/DM.html#DM">DM</A> object
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nel </B></TD><TD>- number of local elements
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nen </B></TD><TD>- number of element nodes
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>e </B></TD><TD>- the local indices of the elements' vertices
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Call <A HREF="../DMDA/DMDARestoreElements.html#DMDARestoreElements">DMDARestoreElements</A>() once you have finished accessing the elements.
<P>
Each process uniquely owns a subset of the elements. That is no element is owned by two or more processes.
<P>
If on each process you integrate over its owned elements and use <A HREF="../Sys/ADD_VALUES.html#ADD_VALUES">ADD_VALUES</A> in <A HREF="../Vec/Vec.html#Vec">Vec</A>/<A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>() then you'll obtain the correct result.
<P>
Not supported in Fortran
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DMDA/DMDAElementType.html#DMDAElementType">DMDAElementType</A>, <A HREF="../DMDA/DMDASetElementType.html#DMDASetElementType">DMDASetElementType</A>(), <A HREF="../Vec/VecSetValuesLocal.html#VecSetValuesLocal">VecSetValuesLocal</A>(), <A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>(), <A HREF="../DM/DMGlobalToLocalBegin.html#DMGlobalToLocalBegin">DMGlobalToLocalBegin</A>(), <A HREF="../DM/DMLocalToGlobalBegin.html#DMLocalToGlobalBegin">DMLocalToGlobalBegin</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/da/dagetelem.c.html#DMDAGetElements">src/dm/impls/da/dagetelem.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/tutorials/ex5.c.html">src/dm/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex70.c.html">src/ksp/ksp/tutorials/ex70.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/tutorials/ex71.c.html">src/ksp/ksp/tutorials/ex71.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/da/dagetelem.c.html#DMDAGetElements_1D">DMDAGetElements_1D in src/dm/impls/da/dagetelem.c</A><BR>
<A HREF="../../../src/dm/impls/da/dagetelem.c.html#DMDAGetElements_2D">DMDAGetElements_2D in src/dm/impls/da/dagetelem.c</A><BR>
<A HREF="../../../src/dm/impls/da/dagetelem.c.html#DMDAGetElements_3D">DMDAGetElements_3D in src/dm/impls/da/dagetelem.c</A><BR>
<BR><A HREF="./index.html">Index of all DMDA routines</A>
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