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<TITLE>TaoSetHessianRoutine</TITLE>
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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="TaoSetHessianRoutine"><H1>TaoSetHessianRoutine</H1></A>
Sets the function to compute the Hessian as well as the location to store the matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsctao.h"
PetscErrorCode TaoSetHessianRoutine(Tao tao, Mat H, Mat Hpre, PetscErrorCode (*func)(Tao, Vec, Mat, Mat, void*), void *ctx)
</PRE>
Logically collective on <A HREF="../Tao/Tao.html#Tao">Tao</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>tao </B></TD><TD>- the <A HREF="../Tao/Tao.html#Tao">Tao</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>H </B></TD><TD>- Matrix used for the hessian
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Hpre </B></TD><TD>- Matrix that will be used operated on by preconditioner, can be same as H
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>hess </B></TD><TD>- Hessian evaluation routine
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- [optional] user-defined context for private data for the
Hessian evaluation routine (may be NULL)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Calling sequence of hess</FONT></H3>
<pre>
hess (<A HREF="../Tao/Tao.html#Tao">Tao</A> tao,<A HREF="../Vec/Vec.html#Vec">Vec</A> x,<A HREF="../Mat/Mat.html#Mat">Mat</A> H,<A HREF="../Mat/Mat.html#Mat">Mat</A> Hpre,void *ctx);
</pre>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>tao </B></TD><TD>- the <A HREF="../Tao/Tao.html#Tao">Tao</A> context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x </B></TD><TD>- input vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>H </B></TD><TD>- Hessian matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Hpre </B></TD><TD>- preconditioner matrix, usually the same as H
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- [optional] user-defined Hessian context
</TD></TR></TABLE>
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/tao/interface/taosolver_hj.c.html#TaoSetHessianRoutine">src/tao/interface/taosolver_hj.c</A>
<BR><A HREF="./index.html">Index of all Tao routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/eptorsion1.c.html">src/tao/unconstrained/examples/tutorials/eptorsion1.c.html</A><BR>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/eptorsion2.c.html">src/tao/unconstrained/examples/tutorials/eptorsion2.c.html</A><BR>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/minsurf2.c.html">src/tao/unconstrained/examples/tutorials/minsurf2.c.html</A><BR>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/rosenbrock1.c.html">src/tao/unconstrained/examples/tutorials/rosenbrock1.c.html</A><BR>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/eptorsion2f.F.html">src/tao/unconstrained/examples/tutorials/eptorsion2f.F.html</A><BR>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/rosenbrock1f.F.html">src/tao/unconstrained/examples/tutorials/rosenbrock1f.F.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/maros.c.html">src/tao/constrained/examples/tutorials/maros.c.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/toy.c.html">src/tao/constrained/examples/tutorials/toy.c.html</A><BR>
<A HREF="../../../src/tao/constrained/examples/tutorials/toyf.F.html">src/tao/constrained/examples/tutorials/toyf.F.html</A><BR>
<A HREF="../../../src/tao/bound/examples/tutorials/plate2.c.html">src/tao/bound/examples/tutorials/plate2.c.html</A><BR>
<A HREF="../../../src/tao/bound/examples/tutorials/jbearing2.c.html">src/tao/bound/examples/tutorials/jbearing2.c.html</A><BR>
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