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<A NAME="Mat_CheckCompressedRow"><H1>Mat_CheckCompressedRow</H1></A>
Determines whether the compressed row matrix format should be used. If the format is to be used, this routine creates Mat_CompressedRow struct. Compressed row format provides high performance routines by taking advantage of zero rows. Supported types are <A HREF="../Mat/MATAIJ.html#MATAIJ">MATAIJ</A>, <A HREF="../Mat/MATBAIJ.html#MATBAIJ">MATBAIJ</A> and <A HREF="../Mat/MATSBAIJ.html#MATSBAIJ">MATSBAIJ</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode Mat_CheckCompressedRow(Mat A,Mat_CompressedRow *compressedrow,PetscInt *ai,PetscInt mbs,PetscReal ratio)
</PRE>
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>A </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>compressedrow </B></TD><TD>- pointer to the struct Mat_CompressedRow
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ai </B></TD><TD>- row pointer used by seqaij and seqbaij
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mbs </B></TD><TD>- number of (block) rows represented by ai
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ratio </B></TD><TD>- ratio of (num of zero rows)/m, used to determine if the compressed row format should be used
</TD></TR></TABLE>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/utils/compressedrow.c.html#Mat_CheckCompressedRow">src/mat/utils/compressedrow.c</A>
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