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<A NAME="MatNullSpaceCreate"><H1>MatNullSpaceCreate</H1></A>
Creates a data structure used to project vectors out of null spaces.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
int MatNullSpaceCreate(MPI_Comm comm,int has_cnst,int n,const Vec vecs[],MatNullSpace *SP)
</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><A HREF="../Sys/comm.html#comm">comm</A> </B></TD><TD>- the MPI communicator associated with the object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>has_cnst </B></TD><TD>- PETSC_TRUE if the null space contains the constant vector; otherwise PETSC_FALSE
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of vectors (excluding constant vector) in null space
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vecs </B></TD><TD>- the vectors that span the null space (excluding the constant vector);
these vectors must be orthonormal. These vectors are NOT copied, so do not change them
after this call. You should free the array that you pass in.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>SP </B> -the null space context
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Users manual sections</FONT></H3>
<DT><B><A HREF="../../manual.pdf#section.4.15">Section 4.15 Solving Singular Systems</A></B> -
<br>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, null space, create
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatNullSpaceDestroy.html#MatNullSpaceDestroy">MatNullSpaceDestroy</A>(), <A HREF="../Mat/MatNullSpaceRemove.html#MatNullSpaceRemove">MatNullSpaceRemove</A>(), <A HREF="../PC/PCNullSpaceAttach.html#PCNullSpaceAttach">PCNullSpaceAttach</A>(), <A HREF="../Mat/MatNullSpace.html#MatNullSpace">MatNullSpace</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matnull.c.html#MatNullSpaceCreate">src/mat/interface/matnull.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/examples/tutorials/ex10.c.html">src/ksp/examples/tutorials/ex10.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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