En Tue, 09 Jun 2009 18:33:39 -0300, Esmail <ebo...@hotmail.com> escribió:
random.random() will generate a random value in the range [0, 1).
Is there an easy way to generate random values in the range [0, 1]?
I.e., including 1?
I think you shouldn't worry about that - the difference may be as small as
2**-53, or 0.0000000000000001
I am implementing an algorithm and want to stay as true to the
original design specifications as possible though I suppose the
difference between the two max values might be minimal.
ps: I'm confused by the docs for uniform():
random.uniform(a, b)
Return a random floating point number N such that a <= N <= b for a
<= b
this seems to imply an inclusive range, ie. [a,b]
random() guarantees a semi-open interval (could return 0, but never 1).
But once you start to operate with the numbers, the limits become fuzzy.
a<b & n>0 => n.a<n.b
The above holds for real numbers but not always for floating point
arithmetic, so one cannot guarantee the semi-open interval anymore:
py> a=10.0
py> b=11.0
py> z = 0.9999999999999999 # assume random.random returned this
py> z<1
True
py> a+(b-a)*z < b # the expression used for uniform(a,b)
False
py> a+(b-a)*z
11.0
The docs are already updated to reflect this:
http://svn.python.org/view/python/trunk/Doc/library/random.rst?r1=68724&r2=68723&pathrev=68724
--
Gabriel Genellina
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