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<A NAME="SNESGetLagJacobian"><H1>SNESGetLagJacobian</H1></A>
Indicates how often the Jacobian is rebuilt. See <A HREF="../SNES/SNESGetLagPreconditioner.html#SNESGetLagPreconditioner">SNESGetLagPreconditioner</A>() to determine when the preconditioner is rebuilt
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode SNESGetLagJacobian(SNES snes,PetscInt *lag)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>snes </B> -the <A HREF="../SNES/SNES.html#SNES">SNES</A> context
<br>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>lag </B> --1 indicates NEVER rebuild, 1 means rebuild every time the Jacobian is computed within a single nonlinear solve, 2 means every second time
the Jacobian is built etc.
<br>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>-snes_lag_jacobian <lag></B> -
Notes:
The default is 1
The jacobian is ALWAYS built in the first iteration of a nonlinear solve unless lag is -1
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, nonlinear, set, convergence, tolerances
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESSetTrustRegionTolerance.html#SNESSetTrustRegionTolerance">SNESSetTrustRegionTolerance</A>(), <A HREF="../SNES/SNESSetLagJacobian.html#SNESSetLagJacobian">SNESSetLagJacobian</A>(), <A HREF="../SNES/SNESSetLagPreconditioner.html#SNESSetLagPreconditioner">SNESSetLagPreconditioner</A>(), <A HREF="../SNES/SNESGetLagPreconditioner.html#SNESGetLagPreconditioner">SNESGetLagPreconditioner</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/interface/snes.c.html#SNESGetLagJacobian">src/snes/interface/snes.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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