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% Thorn documentation template
\documentclass{article}
\begin{document}
\title{NaNChecker}
\author{Thomas Radke}
\date{26 May 2001}
\maketitle
\abstract{Thorn NaNChecker reports NaN values found in variables.}
\section{Purpose}
%
This thorn can be used to analyze CCTK variables of real or complex data type
for NaN (Not-a-Number) and (on availability of {\tt finite(3)}) infinite
values.\\
It does this by registering a routine at {\bf CCTK\_POSTSTEP} which checks
at every {\tt NanChecker::check\_every} iteration all the variables listed in
{\tt NaNChecker::check\_vars} and -- in case a NaN was found -- performs an
action as specified in {\tt NaNChecker::action\_if\_found}.\\
Currently these actions can be to
\begin{itemize}
\item just print a level 1 warning message telling you where NaNs were found
and how many (for grid array variables).\\
For grid arrays it will also print level 2 warnings with the array index
(in fortran order) for all NaN elements. You can limit the number of
such warnings by setting the {\tt NanChecker::report\_max} parameter.
\item also set the CCTK termination flag so that Cactus will stop the evolution
loop and gracefully terminate at the next time possible (giving you the
choice of outputting the data from the last evolution timestep),
\item print the warning message(s) and immediately terminate Cactus
by a call to {\tt CCTK\_Abort()}
\end{itemize}
%
\section{NaNChecker API}
%
Thorn NaNChecker also provides a function API which can be used by other code
to invoke the NaNChecker routine directly:
\begin{itemize}
\item{\bf C API}
\begin{verbatim}
int NaNChecker_NaNCheckVars (const cGH *cctkGH,
int report_max,
const char *check_vars,
const char *action_if_found);
\end{verbatim}
\item{\bf Fortran API}
\begin{verbatim}
call NaNChecker_NaNCheckVars (ierror, cctkGH, report_max,
check_vars, action_if_found)
integer ierror
CCTK_POINTER cctkGH
integer report_max
character*(*) check_vars
character*(*) action_if_found
\end{verbatim}
\end{itemize}
The {\tt report\_max, check\_vars,} and {\tt action\_if\_found} arguments
have the same semantics as their parameter counterparts.\\
If {\tt action\_if\_found} is given as a NULL pointer (C API) or as an empty
string (Fortran API) the routine will be quiet and just return the number of
NaN values found.\\
The C function {\tt NaNChecker\_NaNCheckVars} returns the total number of NaN
values found; this value is stored in the {\tt ierror} argument for the
fortran wrapper routine.
%
% Automatically created from the ccl files
% Do not worry for now.
\include{interface}
\include{param}
\include{schedule}
\end{document}
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