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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="TSComputeIFunction"><H1>TSComputeIFunction</H1></A>
Evaluates the DAE residual written in implicit form F(t,U,Udot)=0
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscts.h"
PetscErrorCode TSComputeIFunction(TS ts,PetscReal t,Vec U,Vec Udot,Vec Y,PetscBool imex)
</PRE>
Collective on <A HREF="../TS/TS.html#TS">TS</A> and <A HREF="../Vec/Vec.html#Vec">Vec</A>
<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>ts </B></TD><TD>- the <A HREF="../TS/TS.html#TS">TS</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>t </B></TD><TD>- current time
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>U </B></TD><TD>- state vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Udot </B></TD><TD>- time derivative of state vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>imex </B></TD><TD>- flag indicates if the method is IMEX so that the RHSFunction should be kept separate
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>Y </B> -right hand side
<br>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
Most users should not need to explicitly call this routine, as it
is used internally within the nonlinear solvers.
<P>
If the user did did not write their equations in implicit form, this
function recasts them in implicit form.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../TS/TS.html#TS">TS</A>, compute
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../TS/TSSetIFunction.html#TSSetIFunction">TSSetIFunction</A>(), <A HREF="../TS/TSComputeRHSFunction.html#TSComputeRHSFunction">TSComputeRHSFunction</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ts/interface/ts.c.html#TSComputeIFunction">src/ts/interface/ts.c</A>
<BR><A HREF="./index.html">Index of all TS routines</A>
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