[Numpy-discussion] arange and floating point arguments
Eike Welk
eike.welk@gmx....
Fri Sep 14 14:49:49 CDT 2007
On Friday 14 September 2007 20:12, Charles R Harris wrote:
> Since none of the numbers are exactly represented in IEEE floating
> point, this sort of oddity is expected. If you look at the exact
> values, (.4 + .2)/.1 > 6 and .6/.1 < 6 . That said, I would expect
You hit send too fast! The fractions that can be represented exactly
in binary are: 1/2, 1/4, 1/8, ... and not 2/10, 4/10, 8/10 ....
See here:
In [1]:0.5 == .25+.25
Out[1]:True
In [2]:.5
Out[2]:0.5
In [3]:.25
Out[3]:0.25
In [4]:.125
Out[4]:0.125
In [8]:.375 == .25 + .125
Out[8]:True
Regards,
Eike.
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