Mercurial > cpython-lru_cache-weakref
diff Doc/lib/libmath.tex @ 32812:d5c97d69dfc7 legacy-trunk
Explain that most floats are actually integers. This is a common confusion
for people using floor(), ceil() and modf().
| author | Tim Peters <tim.peters@gmail.com> |
|---|---|
| date | Mon, 26 Jul 2004 05:12:01 +0000 |
| parents | 6e79dea85189 |
| children |
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--- a/Doc/lib/libmath.tex Mon Jul 26 04:58:50 2004 +0000 +++ b/Doc/lib/libmath.tex Mon Jul 26 05:12:01 2004 +0000 @@ -79,6 +79,14 @@ second return value through an `output parameter' (there is no such thing in Python). +For the \function{ceil()}, \function{floor()}, and \function{modf()} +functions, note that \emph{all} floating-point numbers of sufficiently +large magnitude are exact integers. Python floats typically carry no more +than 53 bits of precision (the same as the platform C double type), in +which case any float \var{x} with \code{abs(\var{x}) >= 2**52} +necessarily has no fractional bits. + + Power and logarithmic functions: \begin{funcdesc}{exp}{x}