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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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-3.7.5 v3.7.5 docs/manualpages/DM/DMDACreate2d.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMDACreate2d"><H1>DMDACreate2d</H1></A>
Creates an object that will manage the communication of two-dimensional regular array data that is distributed across some processors.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
PetscErrorCode DMDACreate2d(MPI_Comm comm,DMBoundaryType bx,DMBoundaryType by,DMDAStencilType stencil_type,
PetscInt M,PetscInt N,PetscInt m,PetscInt n,PetscInt dof,PetscInt s,const PetscInt lx[],const PetscInt ly[],DM *da)
</PRE>
Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>comm </B></TD><TD>- MPI communicator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>bx,by </B></TD><TD>- type of ghost nodes the array have.
Use one of DM_BOUNDARY_NONE, DM_BOUNDARY_GHOSTED, DM_BOUNDARY_PERIODIC.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>stencil_type </B></TD><TD>- stencil type. Use either <A HREF="../DM/DMDA_STENCIL_BOX.html#DMDA_STENCIL_BOX">DMDA_STENCIL_BOX</A> or <A HREF="../DM/DMDA_STENCIL_STAR.html#DMDA_STENCIL_STAR">DMDA_STENCIL_STAR</A>.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>M,N </B></TD><TD>- global dimension in each direction of the array (use -M and or -N to indicate that it may be set to a different value
from the command line with -da_grid_x <M> -da_grid_y <N>)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>m,n </B></TD><TD>- corresponding number of processors in each dimension
(or <A HREF="../Sys/PETSC_DECIDE.html#PETSC_DECIDE">PETSC_DECIDE</A> to have calculated)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dof </B></TD><TD>- number of degrees of freedom per node
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>s </B></TD><TD>- stencil width
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>lx, ly </B></TD><TD>- arrays containing the number of nodes in each cell along
the x and y coordinates, or NULL. If non-null, these
must be of length as m and n, and the corresponding
m and n cannot be <A HREF="../Sys/PETSC_DECIDE.html#PETSC_DECIDE">PETSC_DECIDE</A>. The sum of the lx[] entries
must be M, and the sum of the ly[] entries must be N.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>da </B> -the resulting distributed array object
<br>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-dm_view </B></TD><TD>- Calls <A HREF="../DM/DMView.html#DMView">DMView</A>() at the conclusion of <A HREF="../DM/DMDACreate2d.html#DMDACreate2d">DMDACreate2d</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_grid_x <nx> </B></TD><TD>- number of grid points in x direction, if M < 0
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_grid_y <ny> </B></TD><TD>- number of grid points in y direction, if N < 0
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_processors_x <nx> </B></TD><TD>- number of processors in x direction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_processors_y <ny> </B></TD><TD>- number of processors in y direction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_refine_x <rx> </B></TD><TD>- refinement ratio in x direction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_refine_y <ry> </B></TD><TD>- refinement ratio in y direction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-da_refine <n> </B></TD><TD>- refine the <A HREF="../DM/DMDA.html#DMDA">DMDA</A> n times before creating, if M or N < 0
</TD></TR></TABLE>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The stencil type <A HREF="../DM/DMDA_STENCIL_STAR.html#DMDA_STENCIL_STAR">DMDA_STENCIL_STAR</A> with width 1 corresponds to the
standard 5-pt stencil, while <A HREF="../DM/DMDA_STENCIL_BOX.html#DMDA_STENCIL_BOX">DMDA_STENCIL_BOX</A> with width 1 denotes
the standard 9-pt stencil.
<P>
The array data itself is NOT stored in the <A HREF="../DM/DMDA.html#DMDA">DMDA</A>, it is stored in <A HREF="../Vec/Vec.html#Vec">Vec</A> objects;
The appropriate vector objects can be obtained with calls to <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>()
and <A HREF="../DM/DMCreateLocalVector.html#DMCreateLocalVector">DMCreateLocalVector</A>() and calls to <A HREF="../Vec/VecDuplicate.html#VecDuplicate">VecDuplicate</A>() if more are needed.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
distributed array, create, two-dimensional
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), <A HREF="../DM/DMView.html#DMView">DMView</A>(), <A HREF="../DM/DMDACreate1d.html#DMDACreate1d">DMDACreate1d</A>(), <A HREF="../DM/DMDACreate3d.html#DMDACreate3d">DMDACreate3d</A>(), <A HREF="../DM/DMGlobalToLocalBegin.html#DMGlobalToLocalBegin">DMGlobalToLocalBegin</A>(), <A HREF="../DM/DMDAGetRefinementFactor.html#DMDAGetRefinementFactor">DMDAGetRefinementFactor</A>(),
<BR><A HREF="../DM/DMGlobalToLocalEnd.html#DMGlobalToLocalEnd">DMGlobalToLocalEnd</A>(), <A HREF="../DM/DMLocalToGlobalBegin.html#DMLocalToGlobalBegin">DMLocalToGlobalBegin</A>(), <A HREF="../DM/DMLocalToLocalBegin.html#DMLocalToLocalBegin">DMLocalToLocalBegin</A>(), <A HREF="../DM/DMLocalToLocalEnd.html#DMLocalToLocalEnd">DMLocalToLocalEnd</A>(), <A HREF="../DM/DMDASetRefinementFactor.html#DMDASetRefinementFactor">DMDASetRefinementFactor</A>(),
<A HREF="../DM/DMDAGetInfo.html#DMDAGetInfo">DMDAGetInfo</A>(), <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>(), <A HREF="../DM/DMCreateLocalVector.html#DMCreateLocalVector">DMCreateLocalVector</A>(), <A HREF="../DM/DMDACreateNaturalVector.html#DMDACreateNaturalVector">DMDACreateNaturalVector</A>(), <A HREF="../DM/DMLoad.html#DMLoad">DMLoad</A>(), <A HREF="../DM/DMDAGetOwnershipRanges.html#DMDAGetOwnershipRanges">DMDAGetOwnershipRanges</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/da/da2.c.html#DMDACreate2d">src/dm/impls/da/da2.c</A>
<BR><A HREF="./index.html">Index of all DM routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/examples/tutorials/ex1.c.html">src/dm/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex2.c.html">src/dm/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex3.c.html">src/dm/examples/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex4.c.html">src/dm/examples/tutorials/ex4.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex5.c.html">src/dm/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex7.c.html">src/dm/examples/tutorials/ex7.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex9.c.html">src/dm/examples/tutorials/ex9.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex10.c.html">src/dm/examples/tutorials/ex10.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex12.c.html">src/dm/examples/tutorials/ex12.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex51.c.html">src/dm/examples/tutorials/ex51.c.html</A><BR>
<A HREF="../../../src/dm/examples/tutorials/ex65dm.c.html">src/dm/examples/tutorials/ex65dm.c.html</A><BR>
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