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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatPreallocateLocation"><H1>MatPreallocateLocation</H1></A>
An alternative to MatPreallocationSet() that puts the nonzero locations into the matrix if it exists
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatPreallocateLocations(Mat A,PetscInt row,PetscInt ncols,PetscInt *cols,PetscInt *dnz,PetscInt *onz)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>A </B> -matrix
<br>
<DT><B>row </B> -row where values exist (must be local to this process)
<br>
<DT><B>ncols </B> -number of columns
<br>
<DT><B>cols </B> -columns with nonzeros
<br>
<DT><B>dnz </B> -the array that will be passed to the matrix preallocation routines
<br>
<DT><B>ozn </B> -the other array passed to the matrix preallocation routines
<br>
</TABLE>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
See the <A href="../../docs/manual.pdf#nameddest=<A HREF="../../manual.pdf#chapter.11">Chapter 11 Hints for Performance Tuning</A>">Hints for Performance Improvment</A> chapter in the users manual for more details.
<P>
Do not malloc or free dnz and onz that is handled internally by these routines
<P>
This is a MACRO not a function because it uses a bunch of variables private to the MatPreallocation.... routines.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatPreallocateInitialize.html#MatPreallocateInitialize">MatPreallocateInitialize</A>(), <A HREF="../Mat/MatPreallocateSet.html#MatPreallocateSet">MatPreallocateSet</A>(), <A HREF="../Mat/MatPreallocateSymmetricSet.html#MatPreallocateSymmetricSet">MatPreallocateSymmetricSet</A>(), <A HREF="../Mat/MatPreallocateSetLocal.html#MatPreallocateSetLocal">MatPreallocateSetLocal</A>(),
<BR><A HREF="../Mat/MatPreallocateSymmetricSetLocal.html#MatPreallocateSymmetricSetLocal">MatPreallocateSymmetricSetLocal</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/../../include/petscmat.h.html#MatPreallocateLocation">src/mat/../../include/petscmat.h</A>
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