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<TITLE>MatSetUpPreallocation</TITLE>
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<A NAME="MatSetUpPreallocation"><H1>MatSetUpPreallocation</H1></A>
If the user has not set preallocation for this matrix then a default preallocation that is likely to be inefficient is used.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatSetUpPreallocation(Mat B)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>A </B> -the matrix
<br>
<P>
<P>
Notes: See the Performance chapter of the PETSc users manual for how to preallocate matrices
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
matrix, create
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>((), <A HREF="../Mat/MatCreateMPIAIJ.html#MatCreateMPIAIJ">MatCreateMPIAIJ</A>(),
<BR><A HREF="../Mat/MatCreateSeqDense.html#MatCreateSeqDense">MatCreateSeqDense</A>(), <A HREF="../Mat/MatCreateMPIDense.html#MatCreateMPIDense">MatCreateMPIDense</A>(),
<A HREF="../Mat/MatCreateSeqBAIJ.html#MatCreateSeqBAIJ">MatCreateSeqBAIJ</A>(), <A HREF="../Mat/MatCreateMPIBAIJ.html#MatCreateMPIBAIJ">MatCreateMPIBAIJ</A>(),
<A HREF="../Mat/MatCreateSeqSBAIJ.html#MatCreateSeqSBAIJ">MatCreateSeqSBAIJ</A>(), <A HREF="../Mat/MatCreateMPISBAIJ.html#MatCreateMPISBAIJ">MatCreateMPISBAIJ</A>(),
<A HREF="../Mat/MatConvert.html#MatConvert">MatConvert</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/utils/gcreate.c.html#MatSetUpPreallocation">src/mat/utils/gcreate.c</A>
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