From 2bcc66d39a69c5d24c809b6748ad0e6f1eb98a4e Mon Sep 17 00:00:00 2001
From: tradke <tradke@d60812e6-3970-4df4-986e-c251b06effeb>
Date: Mon, 14 Apr 2003 10:02:43 +0000
Subject: Document new reduction operator "average". Also mark those operators
 which cannot be applied to complex datatypes.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusPUGH/PUGHReduce/trunk@38 d60812e6-3970-4df4-986e-c251b06effeb
---
 doc/documentation.tex | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 1ffbcd7..c83f3f0 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -1,7 +1,7 @@
 \documentclass{article}
 
 % Use the Cactus ThornGuide style file
-% (Automatically used from Cactus distribution, if you have a 
+% (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}
@@ -23,7 +23,7 @@ Reductions operations which are performed using the PUGH driver
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Purpose}
 %
-This thorn registers a number of reduction operators with the flesh. The 
+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.\\
 
@@ -33,17 +33,19 @@ The reduction operations this thorn registers are\\
 \hline
 Reduction Operator & Calculates & By \\
 \hline
-{\tt minimum}   & the minimum of a grid variable & $ \min{ GV } $ \\
-{\tt maximum}   & the maximum of a grid variable & $ \max{ GV } $ \\
-{\tt sum}       & the sum of the elements of a grid variable & $ \sum{ GV } $ \\
-{\tt norm1}     & the L1 norm of a grid variable & $ \left(\Sigma | GV | \right)/n $ \\
-{\tt norm2}     & the L2 norm of a grid variable & $ \sqrt{(\Sigma GV^2)/n} $ \\
-{\tt norm\_inf} & the Inf norm of a grid variable & $ \max{| GV |} $ \\
+{\tt average$^*$}   & the average of a grid variable & $ \sum{ GV }/n $ \\
+{\tt minimum$^*$}   & the minimum of a grid variable & $ \min{ GV } $ \\
+{\tt maximum$^*$}   & the maximum of a grid variable & $ \max{ GV } $ \\
+{\tt sum$^*$}       & the sum of the elements of a grid variable & $ \sum{ GV } $ \\
+{\tt norm1}         & the L1 norm of a grid variable & $ \left(\Sigma | GV | \right)/n $ \\
+{\tt norm2}         & the L2 norm of a grid variable & $ \sqrt{(\Sigma GV^2)/n} $ \\
+{\tt norm\_inf}     & the Inf norm of a grid variable & $ \max{| GV |} $ \\
 \hline
 \end{tabular}\\
 
 In the formulas $GV$ is the grid variable to be reduced, and $n$ denotes the
-number of its elements.
+number of its elements. Reduction operators marked with $^*$ cannot be applied
+to grid variables of complex datatype.
 %
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -69,7 +71,7 @@ function.
 
   /* get the handle for the given reduction operator */
   reduction_handle = CCTK_ReductionHandle (reduction_name);
-  if (reduction_handle >= 0) 
+  if (reduction_handle >= 0)
   {
     /* now do the reduction using the flesh's generic reduction API
       (passing in one input, expecting one output value of REAL type) */
@@ -90,7 +92,7 @@ function.
   else
   {
     CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
-                "Invalid reduction operator '%s'", reduction_name); 
+                "Invalid reduction operator '%s'", reduction_name);
   }
 \end{verbatim}
 
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