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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="SNESGetJacobian"><H1>SNESGetJacobian</H1></A>
Returns the Jacobian matrix and optionally the user provided context for evaluating the Jacobian.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESGetJacobian(SNES snes,Mat *Amat,Mat *Pmat,PetscErrorCode (**J)(SNES,Vec,Mat,Mat,void*),void **ctx)
</PRE>
Not Collective, but <A HREF="../Mat/Mat.html#Mat">Mat</A> object will be parallel if <A HREF="../SNES/SNES.html#SNES">SNES</A> object is
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>snes </B> -the nonlinear solver context
<br>
<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>Amat </B></TD><TD>- location to stash (approximate) Jacobian matrix (or NULL)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Pmat </B></TD><TD>- location to stash matrix used to compute the preconditioner (or NULL)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>J </B></TD><TD>- location to put Jacobian function (or NULL), see <A HREF="../SNES/SNESJacobianFunction.html#SNESJacobianFunction">SNESJacobianFunction</A> for details on its calling sequence
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- location to stash Jacobian ctx (or NULL)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>(), <A HREF="../SNES/SNESComputeJacobian.html#SNESComputeJacobian">SNESComputeJacobian</A>(), <A HREF="../SNES/SNESJacobianFunction.html#SNESJacobianFunction">SNESJacobianFunction</A>, <A HREF="../SNES/SNESGetFunction.html#SNESGetFunction">SNESGetFunction</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/interface/snes.c.html#SNESGetJacobian">src/snes/interface/snes.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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