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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="SNESGetFunction"><H1>SNESGetFunction</H1></A>
Returns the vector where the function is stored.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SNES/SNESGetFunction.html#SNESGetFunction">SNESGetFunction</A>(<A HREF="../SNES/SNES.html#SNES">SNES</A> snes,<A HREF="../Vec/Vec.html#Vec">Vec</A> *r,<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> (**f)(<A HREF="../SNES/SNES.html#SNES">SNES</A>,<A HREF="../Vec/Vec.html#Vec">Vec</A>,<A HREF="../Vec/Vec.html#Vec">Vec</A>,void*),void **ctx)
</PRE>
Not Collective, but <A HREF="../Vec/Vec.html#Vec">Vec</A> is parallel if <A HREF="../SNES/SNES.html#SNES">SNES</A> is parallel. Collective if <A HREF="../Vec/Vec.html#Vec">Vec</A> is requested, but has not been created yet.
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>snes </B> -the <A HREF="../SNES/SNES.html#SNES">SNES</A> context
<br>
<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>r </B></TD><TD>- the vector that is used to store residuals (or NULL if you don't want it)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD>- the function (or NULL if you don't want it); see <A HREF="../SNES/SNESFunction.html#SNESFunction">SNESFunction</A> for calling sequence details
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- the function context (or NULL if you don't want it)
</TD></TR></TABLE>
<P>
<P>
Notes: The vector r DOES NOT, in general contain the current value of the <A HREF="../SNES/SNES.html#SNES">SNES</A> nonlinear function
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, nonlinear, get, function
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESSetFunction.html#SNESSetFunction">SNESSetFunction</A>(), <A HREF="../SNES/SNESGetSolution.html#SNESGetSolution">SNESGetSolution</A>(), <A HREF="../SNES/SNESFunction.html#SNESFunction">SNESFunction</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/snes/interface/snes.c.html#SNESGetFunction">src/snes/interface/snes.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex1.c.html">src/snes/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex12.c.html">src/snes/examples/tutorials/ex12.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex21.c.html">src/snes/examples/tutorials/ex21.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/ex30.c.html">src/snes/examples/tutorials/ex30.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex5f.F90.html">src/snes/examples/tutorials/ex5f.F90.html</A><BR>
<BR><A HREF="./index.html">Index of all SNES 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>
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