From 9c2d9c49727239f7d123143e218db78084b78a3a Mon Sep 17 00:00:00 2001
From: schnetter <>
Date: Fri, 2 May 2003 12:24:00 +0000
Subject: More about boundary conditions.

darcs-hash:20030502122414-07bb3-e9d5d03810fc2eca2cf5d267d120eb24c26ad00d.gz
---
 Carpet/doc/documentation.tex | 22 ++++++++++++++++------
 Carpet/doc/internals.tex     | 23 +++++++++++++----------
 2 files changed, 29 insertions(+), 16 deletions(-)

(limited to 'Carpet/doc')

diff --git a/Carpet/doc/documentation.tex b/Carpet/doc/documentation.tex
index e70ff184f..9aaa66f80 100644
--- a/Carpet/doc/documentation.tex
+++ b/Carpet/doc/documentation.tex
@@ -2,7 +2,7 @@
 %  Cactus Thorn template for ThornGuide documentation
 %  Author: Ian Kelley
 %  Date: Sun Jun 02, 2002
-%  $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/documentation.tex,v 1.5 2003/04/30 20:41:38 schnetter Exp $                                                             
+%  $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/documentation.tex,v 1.6 2003/05/02 14:24:14 schnetter Exp $                                                             
 %
 %  Thorn documentation in the latex file doc/documentation.tex 
 %  will be included in ThornGuides built with the Cactus make system.
@@ -64,7 +64,7 @@
 % *======================================================================* 
 
 % If you are using CVS use this line to give version information
-% $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/documentation.tex,v 1.5 2003/04/30 20:41:38 schnetter Exp $
+% $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/documentation.tex,v 1.6 2003/05/02 14:24:14 schnetter Exp $
 
 \documentclass{article}
 
@@ -72,7 +72,7 @@
 % (Automatically used from Cactus distribution, if you have a 
 %  thorn without the Cactus Flesh download this from the Cactus
 %  homepage at www.cactuscode.org)
-\usepackage{../../../doc/ThornGuide/cactus}
+\usepackage{../../../doc/latex/cactus}
 \usepackage{hyperref}
 
 \begin{document}
@@ -85,7 +85,7 @@
 
 % the date your document was last changed, if your document is in CVS, 
 % please use:
-\date{$ $Date: 2003/04/30 20:41:38 $ $}
+\date{$ $Date: 2003/05/02 14:24:14 $ $}
 
 \maketitle
 
@@ -737,6 +737,17 @@ after handling the time levels has been straightened out.
 
 
 
+\section{Further documentation}
+
+The individual thorns in the Carpet arrangement might contain further
+documentation, which is also available in the thorn guide.
+Additionally, there is a document \texttt{internals.tex} in the
+arrangement's doc directory, and a document
+\texttt{threelev\_initdata.tex} in thorn \texttt{Carpet}'s doc
+directory.
+
+
+
 %% \bibliographystyle{amsalpha}      % initials + year
 %% \bibliography{carpet}
 
@@ -744,8 +755,7 @@ after handling the time levels has been straightened out.
 \providecommand{\MR}{\relax\ifhmode\unskip\space\fi MR }
 % \MRhref is called by the amsart/book/proc definition of \MR.
 \providecommand{\MRhref}[2]{%
-  \href{http://www.ams.org/mathscinet-getitem?mr=#1}{#2}
-}
+  \href{http://www.ams.org/mathscinet-getitem?mr=#1}{#2} }
 \providecommand{\href}[2]{#2}
 \begin{thebibliography}{{Pen}}
 
diff --git a/Carpet/doc/internals.tex b/Carpet/doc/internals.tex
index 35b6666a9..44ebd0397 100644
--- a/Carpet/doc/internals.tex
+++ b/Carpet/doc/internals.tex
@@ -1,11 +1,11 @@
-% $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/internals.tex,v 1.1 2003/04/30 20:41:38 schnetter Exp $
+% $Header: /home/eschnett/C/carpet/Carpet/Carpet/doc/internals.tex,v 1.2 2003/05/02 14:24:14 schnetter Exp $
 
 \documentclass{article}
 \begin{document}
 
 \title{Carpet under the hood}
 \author{Erik Schnetter \textless schnetter@uni-tuebingen.de\textgreater}
-\date{$ $Date: 2003/04/30 20:41:38 $ $}
+\date{$ $Date: 2003/05/02 14:24:14 $ $}
 \maketitle
 
 \tableofcontents
@@ -645,7 +645,7 @@ subroutine restrict_3d_real8
 
 
 
-\section{Regridding, where and when}
+\section{Regridding, how and where and when}
 
    The thorn \texttt{Carpet} provides a routine
    \texttt{RegisterRegridRoutine} where one can register a regridding
@@ -707,13 +707,6 @@ subroutine restrict_3d_real8
 
 
 
-\section{TO DO}
-
-   don't use symmetries or boundary conditions on finer grids;
-   coordinates on finer grids.
-
-
-
 \section{Random ramblings}
 
    Carpet uses the STL, because the STL provides very useful container
@@ -746,4 +739,14 @@ subroutine restrict_3d_real8
    to extract from the core file a stack backtrace and the values of
    the local variables of the current stack frame.
 
+   Using symmetry boundary conditions such as octant mode is currently
+   still awkward in Carpet.  There are several reasons for this:
+   \texttt{CarpetRegrid} does not know about symmetries, and hence
+   doesn't take them into account when choosing refinement regions.
+   The symmetry conditions on the finer grid might be different from
+   the conditions on the coarser grids, and the symmetry thorns cannot
+   cope with this, so this situation must be avoided: one cannot use
+   \texttt{avoid\_origin=yes}, because the finer grids all have
+   \texttt{avoid\_origin=no} due to the vertex-centred refinement.
+
 \end{document}
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