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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<TITLE>PetscOptionsGetTruth</TITLE>
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<A NAME="PetscOptionsGetTruth"><H1>PetscOptionsGetTruth</H1></A>
Gets the Logical (true or false) value for a particular option in the database.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsc.h"
PetscErrorCode PetscOptionsGetTruth(const char pre[],const char name[],PetscTruth *ivalue,PetscTruth *flg)
</PRE>
Not 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>pre </B></TD><TD>- the string to prepend to the name or <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>name </B></TD><TD>- the option one is seeking
</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>ivalue </B></TD><TD>- the logical value to return
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flg </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if found, else <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">C++ variants</FONT></H3><TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD>  PetscOptionsGetTruth(const char b[],PetscTruth *i,PetscTruth *f)<TD WIDTH=20></TD><TD>-></TD><TD WIDTH=20></TD><TD>PetscOptionsGetTruth(PETSC_NULL,b,i,f)</TR></TD>
</TABLE>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
TRUE, true, YES, yes, nostring, and 1 all translate to <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>
FALSE, false, NO, no, and 0 all translate to <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscOptionsGetReal.html#PetscOptionsGetReal">PetscOptionsGetReal</A>(), <A HREF="../Sys/PetscOptionsHasName.html#PetscOptionsHasName">PetscOptionsHasName</A>(), <A HREF="../Sys/PetscOptionsGetString.html#PetscOptionsGetString">PetscOptionsGetString</A>(),
<BR><A HREF="../Sys/PetscOptionsGetIntArray.html#PetscOptionsGetIntArray">PetscOptionsGetIntArray</A>(), <A HREF="../Sys/PetscOptionsGetRealArray.html#PetscOptionsGetRealArray">PetscOptionsGetRealArray</A>(), <A HREF="../Sys/PetscOptionsGetInt.html#PetscOptionsGetInt">PetscOptionsGetInt</A>(), <A HREF="../Sys/PetscOptionsTruth.html#PetscOptionsTruth">PetscOptionsTruth</A>(),
<A HREF="../Sys/PetscOptionsName.html#PetscOptionsName">PetscOptionsName</A>(), <A HREF="../Sys/PetscOptionsBegin.html#PetscOptionsBegin">PetscOptionsBegin</A>(), <A HREF="../Sys/PetscOptionsEnd.html#PetscOptionsEnd">PetscOptionsEnd</A>(), <A HREF="../Sys/PetscOptionsHead.html#PetscOptionsHead">PetscOptionsHead</A>(),
<A HREF="../Sys/PetscOptionsStringArray.html#PetscOptionsStringArray">PetscOptionsStringArray</A>(),<A HREF="../Sys/PetscOptionsRealArray.html#PetscOptionsRealArray">PetscOptionsRealArray</A>(), <A HREF="../Sys/PetscOptionsScalar.html#PetscOptionsScalar">PetscOptionsScalar</A>(),
<A HREF="../Sys/PetscOptionsTruthGroupBegin.html#PetscOptionsTruthGroupBegin">PetscOptionsTruthGroupBegin</A>(), <A HREF="../Sys/PetscOptionsTruthGroup.html#PetscOptionsTruthGroup">PetscOptionsTruthGroup</A>(), <A HREF="../Sys/PetscOptionsTruthGroupEnd.html#PetscOptionsTruthGroupEnd">PetscOptionsTruthGroupEnd</A>(),
<A HREF="../Sys/PetscOptionsList.html#PetscOptionsList">PetscOptionsList</A>(), <A HREF="../Sys/PetscOptionsEList.html#PetscOptionsEList">PetscOptionsEList</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/objects/options.c.html#PetscOptionsGetTruth">src/sys/objects/options.c</A>
<BR><A HREF="./index.html">Index of all Sys routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex5.c.html">src/snes/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex22.c.html">src/snes/examples/tutorials/ex22.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex26.c.html">src/snes/examples/tutorials/ex26.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex27.c.html">src/snes/examples/tutorials/ex27.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex5f.F.html">src/snes/examples/tutorials/ex5f.F.html</A><BR>
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