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<TITLE>DMSlicedSetPreallocation</TITLE>
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<A NAME="DMSlicedSetPreallocation"><H1>DMSlicedSetPreallocation</H1></A>
sets the matrix memory preallocation for matrices computed by DMSliced
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmsliced.h"
#include "petscmat.h"
#include "petscmat.h"
PetscErrorCode DMSlicedSetPreallocation(DM dm,PetscInt d_nz,const PetscInt d_nnz[],PetscInt o_nz,const PetscInt o_nnz[])
</PRE>
Not Collective
<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>slice </B></TD><TD>- the DM object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>d_nz </B></TD><TD>- number of block nonzeros per block row in diagonal portion of local
submatrix (same for all local rows)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>d_nnz </B></TD><TD>- array containing the number of block nonzeros in the various block rows
of the in diagonal portion of the local (possibly different for each block
row) or <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>. You must leave room for the diagonal entry even if it is zero.
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>o_nz </B></TD><TD>- number of block nonzeros per block row in the off-diagonal portion of local
submatrix (same for all local rows).
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>o_nnz </B></TD><TD>- array containing the number of nonzeros in the various block rows of the
off-diagonal portion of the local submatrix (possibly different for
each block row) or <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
See <A HREF="../Mat/MatMPIBAIJSetPreallocation.html#MatMPIBAIJSetPreallocation">MatMPIBAIJSetPreallocation</A>() for more details on preallocation. If a scalar matrix (AIJ) is
obtained with DMSlicedGetMatrix(), the correct preallocation will be set, respecting <A HREF="../DM/DMSlicedSetBlockFills.html#DMSlicedSetBlockFills">DMSlicedSetBlockFills</A>().
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>(), <A HREF="../DM/DMSlicedGetGlobalIndices.html#DMSlicedGetGlobalIndices">DMSlicedGetGlobalIndices</A>(), <A HREF="../Mat/MatMPIAIJSetPreallocation.html#MatMPIAIJSetPreallocation">MatMPIAIJSetPreallocation</A>(),
<BR><A HREF="../Mat/MatMPIBAIJSetPreallocation.html#MatMPIBAIJSetPreallocation">MatMPIBAIJSetPreallocation</A>(), DMSlicedGetMatrix(), <A HREF="../DM/DMSlicedSetBlockFills.html#DMSlicedSetBlockFills">DMSlicedSetBlockFills</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/slicedsliced.c.html#DMSlicedSetPreallocation">src/dm/impls/slicedsliced.c</A>
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