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<A NAME="MatCreateLocalRef"><H1>MatCreateLocalRef</H1></A>
Gets a logical reference to a local submatrix, for use in assembly
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatCreateLocalRef(Mat A,IS isrow,IS iscol,Mat *newmat)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD>- Full matrix, generally parallel
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>isrow </B></TD><TD>- Local index set for the rows
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>iscol </B></TD><TD>- Local index set for the columns
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<DT><B>newmat </B> -New serial <A HREF="../Mat/Mat.html#Mat">Mat</A>
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Most will use <A HREF="../Mat/MatGetLocalSubMatrix.html#MatGetLocalSubMatrix">MatGetLocalSubMatrix</A>() which returns a real matrix corresponding to the local
block if it available, such as with matrix formats that store these blocks separately.
<P>
The new matrix forwards <A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>() and <A HREF="../Mat/MatSetValuesBlockedLocal.html#MatSetValuesBlockedLocal">MatSetValuesBlockedLocal</A>() to the global system.
In general, it does not define <A HREF="../Mat/MatMult.html#MatMult">MatMult</A>() or any other functions. Local submatrices can be nested.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatSetValuesLocal.html#MatSetValuesLocal">MatSetValuesLocal</A>(), <A HREF="../Mat/MatSetValuesBlockedLocal.html#MatSetValuesBlockedLocal">MatSetValuesBlockedLocal</A>(), <A HREF="../Mat/MatGetLocalSubMatrix.html#MatGetLocalSubMatrix">MatGetLocalSubMatrix</A>(), <A HREF="../Mat/MatCreateSubMatrix.html#MatCreateSubMatrix">MatCreateSubMatrix</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/localref/mlocalref.c.html#MatCreateLocalRef">src/mat/impls/localref/mlocalref.c</A>
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