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<TITLE>DMMGSetNullSpace</TITLE>
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<A NAME="DMMGSetNullSpace"><H1>DMMGSetNullSpace</H1></A>
Indicates the null space in the linear operator (this is needed by the linear solver)
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscda.h"
#include "petscksp.h"
#include "petscmg.h"
#include "petscdmmg.h"
#include "petscpc.h"
PetscErrorCode PETSCSNES_DLLEXPORT DMMGSetNullSpace(DMMG *dmmg,PetscTruth has_cnst,PetscInt n,PetscErrorCode (*func)(DMMG,Vec[]))
</PRE>
Collective on <A HREF="../DA/DMMG.html#DMMG">DMMG</A>
<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>dmmg </B></TD><TD>- the context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>has_cnst </B></TD><TD>- is the constant vector in the null space
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of null vectors (excluding the possible constant vector)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>func </B></TD><TD>- a function that fills an array of vectors with the null vectors (must be orthonormal), may be <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DA/DMMGCreate.html#DMMGCreate">DMMGCreate</A>(), <A HREF="../DA/DMMGDestroy.html#DMMGDestroy">DMMGDestroy</A>, <A HREF="../DA/DMMGSetDM.html#DMMGSetDM">DMMGSetDM</A>(), <A HREF="../DA/DMMGSolve.html#DMMGSolve">DMMGSolve</A>(), <A HREF="../Mat/MatNullSpaceCreate.html#MatNullSpaceCreate">MatNullSpaceCreate</A>(), <A HREF="../KSP/KSPSetNullSpace.html#KSPSetNullSpace">KSPSetNullSpace</A>(), DMMGSetUseGalerkin(), <A HREF="../DA/DMMGSetMatType.html#DMMGSetMatType">DMMGSetMatType</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/utils/damg.c.html#DMMGSetNullSpace">src/snes/utils/damg.c</A>
<BR><A HREF="./index.html">Index of all DA routines</A>
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<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex29.c.html">src/ksp/ksp/examples/tutorials/ex29.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex32.c.html">src/ksp/ksp/examples/tutorials/ex32.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex33.c.html">src/ksp/ksp/examples/tutorials/ex33.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex34.c.html">src/ksp/ksp/examples/tutorials/ex34.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex29.c.html">src/snes/examples/tutorials/ex29.c.html</A><BR>
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