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\documentclass{article}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% MANPAGE like description setting for options, use as
% \begin{Lentry} \item[text] text \end{Lentry}
\usepackage{ifthen,calc}
\newcommand{\entrylabel}[1]{\mbox{\textsf{#1}}\hfil}
\newenvironment{entry}
{\begin{list}{}
{\renewcommand{\makelabel}{\entrylabel}
\setlength{\labelwidth}{90pt}
\setlength{\leftmargin}{\labelwidth+\labelsep}
}
}
{\end{list}}
\newlength{\Mylen}
\newcommand{\Lentrylabel}[1]{%
\settowidth{\Mylen}{\textsf{#1}}%
\ifthenelse{\lengthtest{\Mylen > \labelwidth}}%
{\parbox[b]{\labelwidth} % term > labelwidth
{\makebox[0pt][l]{\textsf{#1}}\\}} %
{\textsf{#1}} %
\hfil\relax}
\newenvironment{Lentry}
{\renewcommand{\entrylabel}{\Lentrylabel}
\begin{entry}}
{\end{entry}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\title{PUGHReduce}
\author{Gabrielle Allen, Thomas Radke}
\date{2000}
\maketitle
\abstract{Reductions operations which are performed using the PUGH driver}
\section{Purpose}
This thorn registers a number of reduction operators with the flesh. The
reductions are performed using internals of the PUGH driver, so that this
thorn can only be used when {\tt CactusPUGH/PUGH} is active.
The reduction operations this thorn registers are
\begin{Lentry}
\item[maximum]
Calculates the maximum of a grid variable
\item[minimum]
Calculates the minimum of a grid variable
\item[sum]
Calculates the sum of the elements of a grid variable
\item[norm1]
Calculates the norm of a grid variable
$$
\left(\Sigma | GV | \right)/n
$$
where $n$ is the number of elements
\item[norm2]
Calculates the norm of a grid variable
$$
\sqrt{\Sigma GV^2}/n
$$
where $n$ is the number of elements
\end{Lentry}
\section{Examples}
\begin{itemize}
\item{} Maximum Value of a Grid Function
{\tt
\begin{verbatim}
int ierr;
int handle; /* handle for reduction operator */
int index; /* grid variable index */
CCTK_REAL *value; /* value returned from reduction */
const char *reduction_name = "maximum";
/* reduction operation to use */
handle = CCTK_ReductionHandle (reduction_name);
if (handle >= 0)
{
if ( CCTK_Reduce (cctkGH, 0, handle,
1, CCTK_VARIABLE_REAL,
&value, 1, index) == 0
&& CCTK_MyProc(cctkGH) == 0)
{
printf("Reduction (%s) value is %f\n",reduction_name,value);
}
}
else
{
CCTK_WARN(1,"Invalid reduction operator");
}
\end{verbatim}
}
\end{itemize}
% Automatically created from the ccl files by using gmake thorndoc
\include{interface}
\include{param}
\include{schedule}
\end{document}
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