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<TITLE>MatSNESMFComputeJacobian</TITLE>
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<A NAME="MatSNESMFComputeJacobian"><H1>MatSNESMFComputeJacobian</H1></A>
Tells the matrix-free Jacobian object the new location at which Jacobian matrix vector products will be computed at, i.e. J(x) * a.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
PetscErrorCode PETSCSNES_DLLEXPORT MatSNESMFComputeJacobian(SNES snes,Vec x,Mat *jac,Mat *B,MatStructure *flag,void *dummy)
</PRE>
Collective on <A HREF="../SNES/SNES.html#SNES">SNES</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>snes </B></TD><TD>- the nonlinear solver context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- the point at which the Jacobian vector products will be performed
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>jac </B></TD><TD>- the matrix-free Jacobian object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- either the same as jac or another matrix type (ignored)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flag </B></TD><TD>- not relevent for matrix-free form
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dummy </B></TD><TD>- the user context (ignored)
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This can be passed into <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>() when using a completely matrix-free solver,
that is the B matrix is also the same matrix operator. This is used when you select
-snes_mf but rarely used directly by users.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNESMF/MatSNESMFGetH.html#MatSNESMFGetH">MatSNESMFGetH</A>(), <A HREF="../SNESMF/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(),
<BR><A HREF="../SNESMF/MatSNESMFSetHHistory.html#MatSNESMFSetHHistory">MatSNESMFSetHHistory</A>(),
<A HREF="../SNESMF/MatSNESMFKSPMonitor.html#MatSNESMFKSPMonitor">MatSNESMFKSPMonitor</A>(), <A HREF="../SNESMF/MatSNESMFSetFunctionError.html#MatSNESMFSetFunctionError">MatSNESMFSetFunctionError</A>(), MatSNESMFCreate(), <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>()
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/snes/mf/snesmfj.c.html#MatSNESMFComputeJacobian">src/snes/mf/snesmfj.c</A>
<BR><A HREF="./index.html">Index of all SNESMF routines</A>
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