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Small elaboration and typo fixes.

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Raymond Hettinger 2004-07-12 13:22:14 +00:00
parent 5492f3d977
commit d7c7115926
1 changed files with 19 additions and 5 deletions
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24
Doc/lib/libdecimal.tex
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@ -22,7 +22,7 @@ arithmetic. It offers several advantages over the \class{float()} datatype:
\item Decimal numbers can be represented exactly. In contrast, numbers like
\constant{1.1} do not have an exact representation in binary floating point.
End users typically wound not expect \constant{1.1} to display as
End users typically would not expect \constant{1.1} to display as
\constant{1.1000000000000001} as it does with binary floating point.
\item The exactness carries over into arithmetic. In decimal floating point,
@ -538,7 +538,19 @@ large number of methods for doing arithmetic directly in a given context.
rounding method, flags, and traps are applied to the conversion.
This is useful because constants are often given to a greater precision than
is needed by the application.
is needed by the application. Another benefit is that rounding immediately
eliminates unintended effects from digits beyond the current precision.
In the following example, using unrounded inputs means that adding zero
to a sum can change the result:
\begin{verbatim}
>>> getcontext().prec = 3
>>> Decimal("3.4445") + Decimal("1.0023")
Decimal("4.45")
>>> Decimal("3.4445") + Decimal(0) + Decimal("1.0023")
Decimal("4.44")
\end{verbatim}
\end{methoddesc}
\begin{methoddesc}{Etiny}{}
@ -612,12 +624,14 @@ here.
\begin{methoddesc}{normalize}{x}
Normalize reduces an operand to its simplest form.
Essentially a plus operation with all trailing zeros removed from the
result.
Essentially a \method{plus} operation with all trailing zeros removed from
the result.
\end{methoddesc}
\begin{methoddesc}{plus}{x}
Minus corresponds to the unary prefix plus operator in Python.
Plus corresponds to the unary prefix plus operator in Python. This
operation applies the context precision and rounding, so it is
\emph{not} an identity operation.
\end{methoddesc}
\begin{methoddesc}{power}{x, y\optional{, modulo}}