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<TITLE>TaoDefaultComputeHessianColor</TITLE>
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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.10.3 v3.10.3 docs/manualpages/Tao/TaoDefaultComputeHessianColor.html "><small>Report Typos and Errors</small></a></div>
<A NAME="TaoDefaultComputeHessianColor"><H1>TaoDefaultComputeHessianColor</H1></A>
Computes the Hessian using colored finite differences.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsctao.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Tao/TaoDefaultComputeHessianColor.html#TaoDefaultComputeHessianColor">TaoDefaultComputeHessianColor</A>(<A HREF="../Tao/Tao.html#Tao">Tao</A> tao,<A HREF="../Vec/Vec.html#Vec">Vec</A> V,<A HREF="../Mat/Mat.html#Mat">Mat</A> H,<A HREF="../Mat/Mat.html#Mat">Mat</A> B,void *ctx)
</PRE>
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>V </B></TD><TD>- compute Hessian at this point
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ctx </B></TD><TD>- the PetscColoring object (must be of type <A HREF="../Mat/MatFDColoring.html#MatFDColoring">MatFDColoring</A>)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>H </B></TD><TD>- Hessian matrix (not altered in this routine)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- newly computed Hessian matrix to use with preconditioner (generally the same as H)
</TD></TR></TABLE>
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Tao/TaoSetHessianRoutine.html#TaoSetHessianRoutine">TaoSetHessianRoutine</A>(), <A HREF="../Tao/TaoDefaultComputeHessian.html#TaoDefaultComputeHessian">TaoDefaultComputeHessian</A>(),<A HREF="../SNES/SNESComputeJacobianDefaultColor.html#SNESComputeJacobianDefaultColor">SNESComputeJacobianDefaultColor</A>(), <A HREF="../Tao/TaoSetGradientRoutine.html#TaoSetGradientRoutine">TaoSetGradientRoutine</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/tao/interface/fdiff.c.html#TaoDefaultComputeHessianColor">src/tao/interface/fdiff.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/tao/unconstrained/examples/tutorials/minsurf2.c.html">src/tao/unconstrained/examples/tutorials/minsurf2.c.html</A><BR>
<BR><A HREF="./index.html">Index of all Tao routines</A>
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