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<div id="version" align=right><b>slepc-3.22.2 2024-12-02</b></div>
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<H1>MatCreateTile</H1>
Explicitly build a matrix from four blocks, G = [ a*A b*B; c*C d*D ].
<H3><FONT COLOR="#883300">Synopsis</FONT></H3>
<PRE>
#include "slepcsys.h"
<A HREF="https://petsc.org/release/manualpages/Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../sys/MatCreateTile.html#MatCreateTile">MatCreateTile</A>(<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> a,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> A,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> b,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> B,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> c,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> C,<A HREF="https://petsc.org/release/manualpages/Sys/PetscScalar.html#PetscScalar">PetscScalar</A> d,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> D,<A HREF="https://petsc.org/release/manualpages/Mat/Mat.html#Mat">Mat</A> *G)
</PRE>
Collective
<P>
<H3><FONT COLOR="#883300">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> - matrix for top-left block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD> - scaling factor for block A
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD> - matrix for top-right block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>b </B></TD><TD> - scaling factor for block B
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>C </B></TD><TD> - matrix for bottom-left block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>c </B></TD><TD> - scaling factor for block C
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>D </B></TD><TD> - matrix for bottom-right block
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>d </B></TD><TD> - scaling factor for block D
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>G </B></TD><TD> - the resulting matrix
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#883300">Notes</FONT></H3>
In the case of a parallel matrix, a permuted version of G is returned. The permutation
is a perfect shuffle such that the local parts of A, B, C, D remain in the local part of
G for the same process.
<P>
Matrix G must be destroyed by the user.
<P>
The blocks can be of different type. They can be either ConstantDiagonal, or a standard
type such as AIJ, or any other type provided that it supports the <A HREF="https://petsc.org/release/manualpages/Mat/MatGetRow.html#MatGetRow">MatGetRow</A> operation.
The type of the output matrix will be the same as the first block that is not
ConstantDiagonal (checked in the A,B,C,D order).
<P>
<P>
<H3><FONT COLOR="#883300">See Also</FONT></H3>
<A HREF="https://petsc.org/release/manualpages/Mat/MatCreateNest.html#MatCreateNest">MatCreateNest</A>()
<BR><P><B></B><H3><FONT COLOR="#883300">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#883300">Location</FONT></H3>
</B><A HREF="../../../src/sys/mat/matutil.c.html#MatCreateTile">src/sys/mat/matutil.c</A>
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