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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="SNESUpdateCheckJacobian"><H1>SNESUpdateCheckJacobian</H1></A>
Checks each Jacobian computed by the nonlinear solver comparing the users function with a finite difference computation.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
PetscErrorCode SNESUpdateCheckJacobian(SNES snes,PetscInt it)
</PRE>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_check_jacobian </B></TD><TD>- use this every time <A HREF="../SNES/SNESSolve.html#SNESSolve">SNESSolve</A>() is called
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_check_jacobian_view </B></TD><TD>- Display difference between Jacobian approximated by finite-differencing and the hand-coded Jacobian
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>difference </B></TD><TD>- ||J - Jd||, the norm of the difference of the hand-coded Jacobian J and the approximate Jacobian Jd obtained by finite-differencing
the residual,
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ratio </B></TD><TD>- ||J - Jd||/||J||, the ratio of the norms of the above difference and the hand-coded Jacobian.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Frobenius norm is used in the above throughout. This check is carried out every <A HREF="../SNES/SNES.html#SNES">SNES</A> iteration.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESTEST.html#SNESTEST">SNESTEST</A>, <A HREF="../SNES/SNESCreate.html#SNESCreate">SNESCreate</A>(), <A HREF="../SNES/SNES.html#SNES">SNES</A>, <A HREF="../SNES/SNESSetType.html#SNESSetType">SNESSetType</A>(), <A HREF="../SNES/SNESNEWTONLS.html#SNESNEWTONLS">SNESNEWTONLS</A>, <A HREF="../SNES/SNESNEWTONTR.html#SNESNEWTONTR">SNESNEWTONTR</A>, <A HREF="../SNES/SNESSolve.html#SNESSolve">SNESSolve</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/impls/test/snestest.c.html#SNESUpdateCheckJacobian">src/snes/impls/test/snestest.c</A>
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