Changeset 504
 Timestamp:
 Aug 26, 2005 1:44:10 PM (14 years ago)
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 branches/dev/Docs
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branches/dev/Docs/documentation.tex
r503 r504 617 617 At this point, AMPL users may wish to skip the sections about 618 618 interfacing with code, but should read Section \ref{sec.options} 619 concerning \Ipopt\ options, and Section \ref{sec. ipopt_output} which619 concerning \Ipopt\ options, and Section \ref{sec.output} which 620 620 explains the output displayed by \Ipopt. 621 621 … … 741 741 %\end{eqnarray} 742 742 \begin{equation} 743 \scriptsize744 743 \sigma_f \left[ 745 744 \begin{array}{cccc} … … 1976 1975 console. 1977 1976 1978 \bibliographystyle{plain} 1979 \bibliography{/home/andreasw/tex/andreas} 1977 \section{Ipopt Output}\label{sec.output} 1978 This section describes the standard Ipopt console output with the 1979 default setting for {\tt print\_level}. The output is designed to 1980 provide a quick summary of each iteration as Ipopt solves the problem. 1981 1982 Before Ipopt starts to solve the problem, it displays the problem 1983 statistics (number of variables, etc.). Note that if you have fixed 1984 variables (both upper and lower bounds are equal), Ipopt may remove 1985 these variables from the problem. 1986 1987 Following the problem statistics, Ipopt will begin to solve the 1988 problem and you will see output resembling the following, 1989 \begin{verbatim} 1990 iter objective inf_pr inf_du lg(mu) d lg(rg) alpha_du alpha_pr ls 1991 0 1.6109693e+01 1.12e+01 5.28e01 0.0 0.00e+00  0.00e+00 0.00e+00 0 1992 1 1.8029749e+01 9.90e01 6.62e+01 0.1 2.05e+00  2.14e01 1.00e+00f 1 1993 2 1.8719906e+01 1.25e02 9.04e+00 2.2 5.94e02 2.0 8.04e01 1.00e+00h 1 1994 \end{verbatim} 1995 and the columns of output are defined as, 1996 \begin{itemize} 1997 \item[{\tt iter}] The current iteration count. This includes regular iterations and 1998 iterations while in restoration phase. If in restoration phase, the letter {\tt r'} 1999 will be appended to the iteration number. 2000 \item[{\tt objective}] The unscaled objective value at the current point. In restoration, this value remains the unscaled objective value for the original problem. 2001 \item[{\tt inf\_pr}] The scaled primal infeasibility at the current point. In restoration, this value is the primal infeasibility of the original problem at the current point. 2002 \item[{\tt inf\_du}] The scaled dual infeasibility at the current point. In restoration, this is the value of the dual infeasibility for the restoration problem. 2003 \item[{\tt lg(mu)}] The value of the barrier parameter mu ($log_{10}$). 2004 \item[{\tt d}] The infinity norm (max) of the primal step (in x and s). In restoration, this value includes the values of the additional variables, $p$ and $n$. 2005 \item[{\tt lg(rg)}] The value of the regularization term for the Hessian of the Lagrangian ($log_{10}$). 2006 \item[{\tt alpha\_du}] The stepsize for the dual variables. 2007 \item[{\tt alpha\_pr}] The stepsize for the primal variables. 2008 \item[{\tt ls}] The number of backtracking line search steps. 2009 \end{itemize} 2010 2011 2012 \bibliographystyle{plain} 2013 \bibliography{/home/andreasw/tex/andreas} 1980 2014 1981 2015 %\bibitem{MargotClassText}
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