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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="MatCreateBlockMat"><H1>MatCreateBlockMat</H1></A>
Creates a new matrix in which each block contains a uniform-size sequential <A HREF="../Mat/Mat.html#Mat">Mat</A> object
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatCreateBlockMat.html#MatCreateBlockMat">MatCreateBlockMat</A>(<A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A> comm,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> m,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> n,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> bs,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> nz,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *nnz, <A HREF="../Mat/Mat.html#Mat">Mat</A> *A)
</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>comm </B></TD><TD>- MPI communicator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>m </B></TD><TD>- number of rows
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of columns
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>bs </B></TD><TD>- size of each submatrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nz </B></TD><TD>- expected maximum number of nonzero blocks in row (use <A HREF="../Sys/PETSC_DEFAULT.html#PETSC_DEFAULT">PETSC_DEFAULT</A> if not known)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nnz </B></TD><TD>- expected number of nonzers per block row if known (use NULL otherwise)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</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></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Matrices of this type are nominally-sparse matrices in which each "entry" is a <A HREF="../Mat/Mat.html#Mat">Mat</A> object. Each <A HREF="../Mat/Mat.html#Mat">Mat</A> must
have the same size and be sequential. The local and global sizes must be compatible with this decomposition.
<P>
For matrices containing parallel submatrices and variable block sizes, see <A HREF="../Mat/MATNEST.html#MATNEST">MATNEST</A>.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MATBLOCKMAT.html#MATBLOCKMAT">MATBLOCKMAT</A>, <A HREF="../Mat/MatCreateNest.html#MatCreateNest">MatCreateNest</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/blockmat/seq/blockmat.c.html#MatCreateBlockMat">src/mat/impls/blockmat/seq/blockmat.c</A>
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