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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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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"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SNES/SNESGetLagJacobian.html#SNESGetLagJacobian">SNESGetLagJacobian</A>(<A HREF="../SNES/SNES.html#SNES">SNES</A> snes,<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> *lag)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</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 <A HREF="../SNES/SNES.html#SNES">SNES</A> context
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>lag </B></TD><TD>- -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.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The default is 1
The jacobian is ALWAYS built in the first iteration of a nonlinear solve unless lag is -1 or <A HREF="../SNES/SNESSetLagJacobianPersists.html#SNESSetLagJacobianPersists">SNESSetLagJacobianPersists</A>() was called.
<P>
<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>(), <A HREF="../SNES/SNESSetLagJacobianPersists.html#SNESSetLagJacobianPersists">SNESSetLagJacobianPersists</A>(), <A HREF="../SNES/SNESSetLagPreconditionerPersists.html#SNESSetLagPreconditionerPersists">SNESSetLagPreconditionerPersists</A>()
<BR>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</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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