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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</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-3.14.5 v3.14.5 docs/manualpages/TaoLineSearch/TaoLineSearchGetSolution.html "><small>Report Typos and Errors</small></a></div>
<A NAME="TaoLineSearchGetSolution"><H1>TaoLineSearchGetSolution</H1></A>
Returns the solution to the line search
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petsctaolinesearch.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../TaoLineSearch/TaoLineSearchGetSolution.html#TaoLineSearchGetSolution">TaoLineSearchGetSolution</A>(TaoLineSearch ls, <A HREF="../Vec/Vec.html#Vec">Vec</A> x, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> *f, <A HREF="../Vec/Vec.html#Vec">Vec</A> g, <A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> *steplength, TaoLineSearchConvergedReason *reason)
</PRE>
Collective on TaoLineSearch
<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>ls </B></TD><TD>- the TaoLineSearch 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>x </B></TD><TD>- the new solution
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>f </B></TD><TD>- the objective function value at x
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>g </B></TD><TD>- the gradient at x
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>steplength </B></TD><TD>- the multiple of the step direction taken by the line search
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>reason </B></TD><TD>- the reason why the line search terminated
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">reason will be set to one of</FONT></H3>
<P>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_FAILED_INFORNAN </B></TD><TD>- function evaluation gives Inf or Nan value
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_FAILED_BADPARAMETER </B></TD><TD>- negative value set as parameter
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_FAILED_ASCENT </B></TD><TD>- initial line search step * g is not descent direction
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_MAXFCN </B></TD><TD>- maximum number of function evaluation reached
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_UPPERBOUND </B></TD><TD>- step is at upper bound
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_LOWERBOUND </B></TD><TD>- step is at lower bound
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_RTOL </B></TD><TD>- range of uncertainty is smaller than given tolerance
</TD></TR>
<P>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_USER </B></TD><TD>- user can set this reason to stop line search
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_HALTED_OTHER </B></TD><TD>- any other reason
</TD></TR>
<P>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>TAOLINESEARCH_SUCCESS </B></TD><TD>- successful line search
</TD></TR></TABLE>
<P>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/tao/linesearch/interface/taolinesearch.c.html#TaoLineSearchGetSolution">src/tao/linesearch/interface/taolinesearch.c</A>
<BR><A HREF="./index.html">Index of all TaoLineSearch routines</A>
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