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<TITLE>TSDefaultComputeJacobian</TITLE>
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<A NAME="TSDefaultComputeJacobian"><H1>TSDefaultComputeJacobian</H1></A>
Computes the Jacobian using finite differences.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
#include "petscts.h"
PetscErrorCode TSDefaultComputeJacobian(TS ts,PetscReal t,Vec xx1,Mat *J,Mat *B,MatStructure *flag,void *ctx)
</PRE>
<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>ts </B></TD><TD>- <A HREF="../TS/TS.html#TS">TS</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>xx1 </B></TD><TD>- compute Jacobian at this point
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- application's function context, as set with <A HREF="../SNES/SNESSetFunction.html#SNESSetFunction">SNESSetFunction</A>()
</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>- Jacobian
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- preconditioner, same as Jacobian
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flag </B></TD><TD>- matrix flag
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This routine is slow and expensive, and is not optimized.
<P>
Sparse approximations using colorings are also available and
would be a much better alternative!
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../TS/TSDefaultComputeJacobianColor.html#TSDefaultComputeJacobianColor">TSDefaultComputeJacobianColor</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ts/interface/tsfd.c.html#TSDefaultComputeJacobian">src/ts/interface/tsfd.c</A>
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