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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="TSComputeIFunctionLinear"><H1>TSComputeIFunctionLinear</H1></A>
Evaluate the left hand side via the user-provided Jacobian, for linear problems only
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscts.h"
PetscErrorCode TSComputeIFunctionLinear(TS ts,PetscReal t,Vec U,Vec Udot,Vec F,void *ctx)
</PRE>
Collective on <A HREF="../TS/TS.html#TS">TS</A>
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ts </B></TD><TD>- time stepping context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>t </B></TD><TD>- time at which to evaluate
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>U </B></TD><TD>- state at which to evaluate
</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>ctx </B></TD><TD>- context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<DT><B>F </B> -left hand side
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The assumption here is that the left hand side is of the form A*Udot (and not A*Udot + B*U). For other cases, the
user is required to write their own <A HREF="../TS/TSComputeIFunction.html#TSComputeIFunction">TSComputeIFunction</A>.
This function is intended to be passed to <A HREF="../TS/TSSetIFunction.html#TSSetIFunction">TSSetIFunction</A>() to evaluate the left hand side for linear problems.
The matrix (and optionally the evaluation context) should be passed to <A HREF="../TS/TSSetIJacobian.html#TSSetIJacobian">TSSetIJacobian</A>().
<P>
Note that using this function is NOT equivalent to using <A HREF="../TS/TSComputeRHSFunctionLinear.html#TSComputeRHSFunctionLinear">TSComputeRHSFunctionLinear</A>() since that solves Udot = A U
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../TS/TSSetIFunction.html#TSSetIFunction">TSSetIFunction</A>(), <A HREF="../TS/TSSetIJacobian.html#TSSetIJacobian">TSSetIJacobian</A>(), <A HREF="../TS/TSComputeIJacobianConstant.html#TSComputeIJacobianConstant">TSComputeIJacobianConstant</A>(), <A HREF="../TS/TSComputeRHSFunctionLinear.html#TSComputeRHSFunctionLinear">TSComputeRHSFunctionLinear</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/ts.c.html#TSComputeIFunctionLinear">src/ts/interface/ts.c</A>
<BR><A HREF="./index.html">Index of all TS routines</A>
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