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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="MatSetBlockSizes"><H1>MatSetBlockSizes</H1></A>
Sets the matrix block row and column sizes.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatSetBlockSizes(Mat mat,PetscInt rbs,PetscInt cbs)
</PRE>
Logically Collective on <A HREF="../Mat/Mat.html#Mat">Mat</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>rbs </B></TD><TD>- row block size
</TD></TR></TABLE>
<DT><B>cbs </B> -column block size
<br>
</TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Block row formats are <A HREF="../Mat/MATSEQBAIJ.html#MATSEQBAIJ">MATSEQBAIJ</A>, <A HREF="../Mat/MATMPIBAIJ.html#MATMPIBAIJ">MATMPIBAIJ</A>, <A HREF="../Mat/MATSEQSBAIJ.html#MATSEQSBAIJ">MATSEQSBAIJ</A>, <A HREF="../Mat/MATMPISBAIJ.html#MATMPISBAIJ">MATMPISBAIJ</A>. These formats ALWAYS have square block storage in the matrix.
If you pass a different block size for the columns than the rows, the row block size determines the square block storage.
<P>
This must be called before <A HREF="../Mat/MatSetUp.html#MatSetUp">MatSetUp</A>() or MatXXXSetPreallocation() (or will default to 1) and the block size cannot be changed later
<P>
The row and column block size determine the blocksize of the "row" and "column" vectors returned by <A HREF="../Mat/MatCreateVecs.html#MatCreateVecs">MatCreateVecs</A>().
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateSeqBAIJ.html#MatCreateSeqBAIJ">MatCreateSeqBAIJ</A>(), <A HREF="../Mat/MatCreateBAIJ.html#MatCreateBAIJ">MatCreateBAIJ</A>(), <A HREF="../Mat/MatGetBlockSize.html#MatGetBlockSize">MatGetBlockSize</A>(), <A HREF="../Mat/MatSetBlockSize.html#MatSetBlockSize">MatSetBlockSize</A>(), <A HREF="../Mat/MatGetBlockSizes.html#MatGetBlockSizes">MatGetBlockSizes</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatSetBlockSizes">src/mat/interface/matrix.c</A>
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