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<TITLE>PCFieldSplitSetDetectSaddlePoint</TITLE>
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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/PC/PCFieldSplitSetDetectSaddlePoint.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCFieldSplitSetDetectSaddlePoint"><H1>PCFieldSplitSetDetectSaddlePoint</H1></A>
Sets flag indicating whether PCFieldSplit will attempt to automatically determine fields based on zero diagonal entries.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PC/PCFieldSplitSetDetectSaddlePoint.html#PCFieldSplitSetDetectSaddlePoint">PCFieldSplitSetDetectSaddlePoint</A>(<A HREF="../PC/PC.html#PC">PC</A> pc,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> flg)
</PRE>
Logically Collective
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Also sets the split type to <A HREF="../PC/PCCompositeType.html#PCCompositeType">PC_COMPOSITE_SCHUR</A> (see <A HREF="../PC/PCFieldSplitSetType.html#PCFieldSplitSetType">PCFieldSplitSetType</A>()) and the Schur preconditioner type to <A HREF="../PC/PCFieldSplitSchurPreType.html#PCFieldSplitSchurPreType">PC_FIELDSPLIT_SCHUR_PRE_SELF</A> (see <A HREF="../PC/PCFieldSplitSetSchurPre.html#PCFieldSplitSetSchurPre">PCFieldSplitSetSchurPre</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 Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flg </B></TD><TD>- boolean indicating whether to detect fields or not
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_fieldsplit_detect_saddle_point</B></TD></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCFIELDSPLIT.html#PCFIELDSPLIT">PCFIELDSPLIT</A>, <A HREF="../PC/PCFieldSplitSetDetectSaddlePoint.html#PCFieldSplitSetDetectSaddlePoint">PCFieldSplitSetDetectSaddlePoint</A>(), <A HREF="../PC/PCFieldSplitSetType.html#PCFieldSplitSetType">PCFieldSplitSetType</A>(), <A HREF="../PC/PCFieldSplitSetSchurPre.html#PCFieldSplitSetSchurPre">PCFieldSplitSetSchurPre</A>()
<BR>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>Intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/impls/fieldsplit/fieldsplit.c.html#PCFieldSplitSetDetectSaddlePoint">src/ksp/pc/impls/fieldsplit/fieldsplit.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/impls/stag/tutorials/ex2.c.html">src/dm/impls/stag/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/dm/impls/stag/tutorials/ex3.c.html">src/dm/impls/stag/tutorials/ex3.c.html</A><BR>
<BR><A HREF="./index.html">Index of all PC routines</A>
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