diff options
author | tradke <tradke@ff385933-4943-42dc-877b-ffc776028de6> | 2003-06-12 09:25:30 +0000 |
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committer | tradke <tradke@ff385933-4943-42dc-877b-ffc776028de6> | 2003-06-12 09:25:30 +0000 |
commit | c78af4d3724f4ee7fe7a8442e8aae8095e83da96 (patch) | |
tree | d813ee733ffa886d8bfec8dd5a4f959691ec09fa /doc | |
parent | 74bbad1a068191bdc4b1c6bd792eb0f8c9716d58 (diff) |
Document how to track NaN positions in grid functions using a mask array,
and how to visualize them in OpenDX.
git-svn-id: http://svn.cactuscode.org/arrangements/CactusUtils/NaNChecker/trunk@40 ff385933-4943-42dc-877b-ffc776028de6
Diffstat (limited to 'doc')
-rw-r--r-- | doc/documentation.tex | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/doc/documentation.tex b/doc/documentation.tex index 6ed8d94..4dd7a8e 100644 --- a/doc/documentation.tex +++ b/doc/documentation.tex @@ -18,7 +18,7 @@ % START CACTUS THORNGUIDE \begin{abstract} -Thorn NaNChecker reports NaN values found in variables. +Thorn NaNChecker reports NaN values found in CCTK grid variables. \end{abstract} % Do not delete next line @@ -83,8 +83,8 @@ also set the CCTK termination flag so that Cactus will stop the evolution \item{\tt abort} -print the warning message(s) and immediately terminate Cactus - by a call to {\tt CCTK\_Abort()} +print the warning message(s) and immediately terminate Cactus after checking +all variables from {\tt NaNChecker::check\_vars} by a call to {\tt CCTK\_Abort()} \end{itemize} By default, the current timelevel of the variables given in @@ -98,6 +98,37 @@ of the variable grid::x, timelevel 1 of {\tt grid::y} and timelevel 2 of {\tt NaNChecker::check\_vars = "grid::x grid::y[timelevel=1] grid::z[timelevel=2]"} % +\section{Tracking and Visualizing NaNs Positions} +% +The NaNChecker thorn can also mark the positions (in grid index points) +of all the NaNs found for a given list of CCTK grid functions in a mask array +and save this array to an HDF5 file. + +The mask array is declared as a grid function {\tt NaNChecker::NaNmask} with +data type INTEGER. Each bit $i$ in an integer element is used to flag a NaN +value found in grid function $i$ at the corresponding grid position +(the counting for $i$ starts at 0 and is incremented for each grid function +as it appears in {\tt NaNChecker::check\_vars}). +Thus the NaN locations of up to 32 individual grid functions can be coded +in the NaNmask array. + +In order to activate the NaNmask output you need to set the parameter +{\tt NaNChecker::out\_NaNmask} to {\tt "yes"} (which is already the default) +and have the IOHDF5 thorn activated. + +The NaN locations can be visualized with OpenDX. An example DX network +{\tt VisualizeNaNs.net} and a sample NaNmask HDF5 output file {\tt NaNmask.h5} +are available via anonymous CVS from the NumRel CVS server: +\begin{verbatim} + # this is for (t)csh; use export CVSROOT for bash + setenv CVSROOT :pserver:cvs_anon@cvs.aei.mpg.de:/numrelcvs + + # CVS pserver password is 'anon' + cvs login + cvs checkout AEIPhysics/Visualization/OpenDX/Networks/Miscellaneous +\end{verbatim} + +% \section{NaNChecker API} % Thorn NaNChecker also provides a function API which can be used by other code |