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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="MatCreateSubMatricesMPI"><H1>MatCreateSubMatricesMPI</H1></A>
Extracts MPI submatrices across a sub communicator of mat (by pairs of <A HREF="../IS/IS.html#IS">IS</A> that may live on subcomms).
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatCreateSubMatricesMPI.html#MatCreateSubMatricesMPI">MatCreateSubMatricesMPI</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> mat,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> n,const <A HREF="../IS/IS.html#IS">IS</A> irow[],const <A HREF="../IS/IS.html#IS">IS</A> icol[],<A HREF="../Mat/MatReuse.html#MatReuse">MatReuse</A> scall,<A HREF="../Mat/Mat.html#Mat">Mat</A> *submat[])
</PRE>
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>n </B></TD><TD>- the number of submatrixes to be extracted
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>irow, icol </B></TD><TD>- index sets of rows and columns to extract
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>scall </B></TD><TD>- either <A HREF="../Mat/MatReuse.html#MatReuse">MAT_INITIAL_MATRIX</A> or <A HREF="../Mat/MatReuse.html#MatReuse">MAT_REUSE_MATRIX</A>
</TD></TR></TABLE>
<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>submat </B></TD><TD>- the array of submatrices
</TD></TR></TABLE>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateSubMatrices.html#MatCreateSubMatrices">MatCreateSubMatrices</A>(), <A HREF="../Mat/MatCreateSubMatrix.html#MatCreateSubMatrix">MatCreateSubMatrix</A>(), <A HREF="../Mat/MatGetRow.html#MatGetRow">MatGetRow</A>(), <A HREF="../Mat/MatGetDiagonal.html#MatGetDiagonal">MatGetDiagonal</A>(), <A HREF="../Mat/MatReuse.html#MatReuse">MatReuse</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/interface/matrix.c.html#MatCreateSubMatricesMPI">src/mat/interface/matrix.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/adj/mpi/mpiadj.c.html#MatCreateSubMatricesMPI_MPIAdj">MatCreateSubMatricesMPI_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c</A><BR>
src/mat/impls/aij/mpi/mpiov.c:3075:PetscErrorCode MatCreateSubMatricesMPI_MPIXAIJ(Mat C,PetscInt ismax,const IS isrow[],const IS iscol[],MatReuse scall,Mat *submat[],
<A HREF="../../../src/mat/impls/aij/mpi/mpiov.c.html#MatCreateSubMatricesMPI_MPIAIJ">MatCreateSubMatricesMPI_MPIAIJ in src/mat/impls/aij/mpi/mpiov.c</A><BR>
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