[Python-checkins] python/dist/src/Doc/lib libdecimal.tex, 1.27, 1.28

[rhettinger@users.sourceforge.net]

Update of /cvsroot/python/python/dist/src/Doc/lib
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv19113

Modified Files:
	libdecimal.tex 
Log Message:
More info on rounding modes.  Add sections for floating point notes.

Index: libdecimal.tex
===================================================================
RCS file: /cvsroot/python/python/dist/src/Doc/lib/libdecimal.tex,v
retrieving revision 1.27
retrieving revision 1.28
diff -u -d -r1.27 -r1.28
--- libdecimal.tex	15 Jun 2005 16:53:31 -0000	1.27
+++ libdecimal.tex	1 Jul 2005 16:54:12 -0000	1.28
@@ -501,13 +501,15 @@
   arithmetic operations in the context.
 
   The \var{rounding} option is one of:
-      \constant{ROUND_CEILING} (towards \constant{Infinity}),
-      \constant{ROUND_DOWN} (towards zero),
-      \constant{ROUND_FLOOR} (towards \constant{-Infinity}),
-      \constant{ROUND_HALF_DOWN} (towards zero),
-      \constant{ROUND_HALF_EVEN},
-      \constant{ROUND_HALF_UP} (away from zero), or
-      \constant{ROUND_UP} (away from zero).
+  \begin{itemize}
+  \item \constant{ROUND_CEILING} (towards \constant{Infinity}),
+  \item \constant{ROUND_DOWN} (towards zero),
+  \item \constant{ROUND_FLOOR} (towards \constant{-Infinity}),
+  \item \constant{ROUND_HALF_DOWN} (to nearest with ties going towards zero),
+  \item \constant{ROUND_HALF_EVEN} (to nearest with ties going to nearest even integer),
+  \item \constant{ROUND_HALF_UP} (to nearest with ties going away from zero), or
+  \item \constant{ROUND_UP} (away from zero).
+  \end{itemize}
 
   The \var{traps} and \var{flags} fields list any signals to be set.
   Generally, new contexts should only set traps and leave the flags clear.
@@ -834,6 +836,8 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \subsection{Floating Point Notes \label{decimal-notes}}
 
+\subsubsection{Mitigating round-off error with increased precision}
+
 The use of decimal floating point eliminates decimal representation error
 (making it possible to represent \constant{0.1} exactly); however, some
 operations can still incur round-off error when non-zero digits exceed the
@@ -881,6 +885,7 @@
 Decimal("0.0060000")
 \end{verbatim}
 
+\subsubsection{Special values}
 
 The number system for the \module{decimal} module provides special
 values including \constant{NaN}, \constant{sNaN}, \constant{-Infinity},