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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="PCFieldSplitSchurGetSubKSP"><H1>PCFieldSplitSchurGetSubKSP</H1></A>
Gets the <A HREF="../KSP/KSP.html#KSP">KSP</A> contexts used inside the Schur complement based <A HREF="../PC/PCFIELDSPLIT.html#PCFIELDSPLIT">PCFIELDSPLIT</A>
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PC/PCFieldSplitSchurGetSubKSP.html#PCFieldSplitSchurGetSubKSP">PCFieldSplitSchurGetSubKSP</A>(<A HREF="../PC/PC.html#PC">PC</A> pc,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *n,<A HREF="../KSP/KSP.html#KSP">KSP</A> *subksp[])
</PRE>
Collective on <A HREF="../KSP/KSP.html#KSP">KSP</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the preconditioner context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- the number of splits
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>subksp </B></TD><TD>- the array of <A HREF="../KSP/KSP.html#KSP">KSP</A> contexts
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
After <A HREF="../PC/PCFieldSplitSchurGetSubKSP.html#PCFieldSplitSchurGetSubKSP">PCFieldSplitSchurGetSubKSP</A>() the array of KSPs is to be freed by the user with <A HREF="../Sys/PetscFree.html#PetscFree">PetscFree</A>()
(not the <A HREF="../KSP/KSP.html#KSP">KSP</A> just the array that contains them).
<P>
You must call <A HREF="../PC/PCSetUp.html#PCSetUp">PCSetUp</A>() before calling <A HREF="../PC/PCFieldSplitSchurGetSubKSP.html#PCFieldSplitSchurGetSubKSP">PCFieldSplitSchurGetSubKSP</A>().
<P>
If the fieldsplit type is of type <A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SCHUR</A>, it returns (in order)
- the <A HREF="../KSP/KSP.html#KSP">KSP</A> used for the (1,1) block
- the <A HREF="../KSP/KSP.html#KSP">KSP</A> used for the Schur complement (not the one used for the interior Schur solver)
- the <A HREF="../KSP/KSP.html#KSP">KSP</A> used for the (1,1) block in the upper triangular factor (if different from that of the (1,1) block).
<P>
It returns a null array if the fieldsplit is not of type <A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SCHUR</A>; in this case, you should use <A HREF="../PC/PCFieldSplitGetSubKSP.html#PCFieldSplitGetSubKSP">PCFieldSplitGetSubKSP</A>().
<P>
Fortran Usage: You must pass in a <A HREF="../KSP/KSP.html#KSP">KSP</A> array that is large enough to contain all the local KSPs.
You can call <A HREF="../PC/PCFieldSplitSchurGetSubKSP.html#PCFieldSplitSchurGetSubKSP">PCFieldSplitSchurGetSubKSP</A>(pc,n,PETSC_NULL_KSP,ierr) to determine how large the
<A HREF="../KSP/KSP.html#KSP">KSP</A> array must be.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCFIELDSPLIT.html#PCFIELDSPLIT">PCFIELDSPLIT</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/ksp/pc/impls/fieldsplit/fieldsplit.c.html#PCFieldSplitSchurGetSubKSP">src/ksp/pc/impls/fieldsplit/fieldsplit.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/ksp/pc/impls/fieldsplit/fieldsplit.c.html#PCFieldSplitSchurGetSubKSP_FieldSplit">PCFieldSplitSchurGetSubKSP_FieldSplit in src/ksp/pc/impls/fieldsplit/fieldsplit.c</A><BR>
<BR><A HREF="./index.html">Index of all PC routines</A>
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