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<TITLE>MatPreallocSymmetricInitialize</TITLE>
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<A NAME="MatPreallocSymmetricInitialize"><H1>MatPreallocSymmetricInitialize</H1></A>
Begins the block of code that will count the number of nonzeros per row in a matrix providing the data that one can use to correctly preallocate the matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
int MatPreallocateSymmetricInitialize(MPI_Comm comm, int nrows, int ncols, int *dnz, int *onz)
</PRE>
Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<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><A HREF="../Sys/comm.html#comm">comm</A> </B></TD><TD>- the communicator that will share the eventually allocated matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nrows </B></TD><TD>- the number of rows in the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ncols </B></TD><TD>- the number of columns in the matrix
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dnz </B></TD><TD>- the array that will be passed to the matrix preallocation routines
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ozn </B></TD><TD>- the other array passed to the matrix preallocation routines
</TD></TR></TABLE>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
See the chapter in the users manual on performance for more details
<P>
Do not malloc or free dnz and onz, that is handled internally by these routines
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
MatPreallocateFinalize(), <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>MatPreallocateInitialize(), <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#MatPreallocSymmetricInitialize">src/mat/../../include/petscmat.h</A>
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