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<A NAME="GSNESEvaluateJacobian"><H1>GSNESEvaluateJacobian</H1></A>
Constructs the system matrix for Newton's equation
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
#include "gsolver.h"
int GSNESEvaluateJacobian(GSNES snes, GVec x, GMat *J, GMat *M, MatStructure *flag, PetscObject ctx)
</PRE>
Collective on GSNES
<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>snes </B></TD><TD>- The grid <A HREF="../SNES/SNES.html#SNES">SNES</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- The current iterate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flag </B></TD><TD>- The matrix structure flag
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- The optional user 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>J </B></TD><TD>- The Jacobian matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Vec/M.html#M">M</A> </B></TD><TD>- The preconditioner for the Jacobian matrix, usually the same as J
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
grid <A HREF="../SNES/SNES.html#SNES">SNES</A>, jacobian
<BR>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../GSolver/GSNESEvaluateJacobianMF.html#GSNESEvaluateJacobianMF">GSNESEvaluateJacobianMF</A>(), <A HREF="../GSolver/GSNESEvaluateRhs.html#GSNESEvaluateRhs">GSNESEvaluateRhs</A>(), <A HREF="../Grid/GridEvaluateSystemMatrix.html#GridEvaluateSystemMatrix">GridEvaluateSystemMatrix</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/gsolver/interface/gsnes.c.html#GSNESEvaluateJacobian">src/gsolver/interface/gsnes.c</A>
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