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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="DMPlexPreallocateOperator"><H1>DMPlexPreallocateOperator</H1></A>
Calculate the matrix nonzero pattern based upon the information in the <A HREF="../DM/DM.html#DM">DM</A>, the <A HREF="../DM/PetscDS.html#PetscDS">PetscDS</A> it contains, and the default <A HREF="../PetscSection/PetscSection.html#PetscSection">PetscSection</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmplex.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMPLEX/DMPlexPreallocateOperator.html#DMPlexPreallocateOperator">DMPlexPreallocateOperator</A>(<A HREF="../DM/DM.html#DM">DM</A> dm, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> bs, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> dnz[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> onz[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> dnzu[], <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> onzu[], <A HREF="../Mat/Mat.html#Mat">Mat</A> A, <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> fillMatrix)
</PRE>
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>dm </B></TD><TD>- The DMPlex
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>bs </B></TD><TD>- The matrix blocksize
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dnz </B></TD><TD>- An array to hold the number of nonzeros in the diagonal block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>onz </B></TD><TD>- An array to hold the number of nonzeros in the off-diagonal block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dnzu </B></TD><TD>- An array to hold the number of nonzeros in the upper triangle of the diagonal block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>onzu </B></TD><TD>- An array to hold the number of nonzeros in the upper triangle of the off-diagonal block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fillMatrix </B></TD><TD>- If <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>, fill the matrix with zeros
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Ouput Argument</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD>- The preallocated matrix
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMCreateMatrix.html#DMCreateMatrix">DMCreateMatrix</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/plex/plexpreallocate.c.html#DMPlexPreallocateOperator">src/dm/impls/plex/plexpreallocate.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/dm/impls/plex/plexpreallocate.c.html#DMPlexPreallocateOperator_2">DMPlexPreallocateOperator_2 in src/dm/impls/plex/plexpreallocate.c</A><BR>
<BR><A HREF="./index.html">Index of all DMPLEX routines</A>
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