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<A NAME="MatMFFDAddNullSpace"><H1>MatMFFDAddNullSpace</H1></A>
Provides a null space that an operator is supposed to have. Since roundoff will create a small component in the null space, if you know the null space you may have it automatically removed.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatMFFDAddNullSpace(Mat J,MatNullSpace nullsp)
</PRE>
Logically Collective on <A HREF="../Mat/Mat.html#Mat">Mat</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>J </B></TD><TD>- the matrix-free matrix context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nullsp </B></TD><TD>- object created with <A HREF="../Mat/MatNullSpaceCreate.html#MatNullSpaceCreate">MatNullSpaceCreate</A>()
</TD></TR></TABLE>
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<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, matrix-free, null space
<BR>
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<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatNullSpaceCreate.html#MatNullSpaceCreate">MatNullSpaceCreate</A>(), <A HREF="../Mat/MatMFFDGetH.html#MatMFFDGetH">MatMFFDGetH</A>(), <A HREF="../SNES/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(), <A HREF="../Mat/MatCreateMFFD.html#MatCreateMFFD">MatCreateMFFD</A>(), <A HREF="../Mat/MATMFFD.html#MATMFFD">MATMFFD</A>
<BR><A HREF="../Mat/MatMFFDSetHHistory.html#MatMFFDSetHHistory">MatMFFDSetHHistory</A>(), <A HREF="../Mat/MatMFFDResetHHistory.html#MatMFFDResetHHistory">MatMFFDResetHHistory</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/mffd/mffd.c.html#MatMFFDAddNullSpace">src/mat/impls/mffd/mffd.c</A>
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