[Numpy-discussion] Behavior of np.random.uniform

[Chris Barker]

On Tue, Jan 19, 2016 at 9:27 AM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

> On Tue, Jan 19, 2016 at 9:23 AM, Chris Barker - NOAA Federal <
> chris.barker at noaa.gov> wrote:
>
>> What does the standard lib do for rand range? I see that randint Is
>> closed on both ends, so order doesn't matter, though if it raises for b<a,
>> then that's a precedent we could follow.
>>
>
> randint is not closed on the high end. The now deprecated random_integers
> is the function that does that.
>

I was referring to the stdlib randint:

In [*7*]: [random.randint(2,5) for i in range(10)]

Out[*7*]: [5, 5, 2, 4, 5, 5, 3, 5, 2, 2]
thinking that compatibility with that would be good -- but that ship has
sailed.

randrange is open on the high end, as range is, (duh!)

 [random.randrange(2,5) for i in range(10)]

Out[*9*]: [3, 3, 4, 3, 3, 2, 4, 2, 3, 3]
but you get an exception is low >=high:

In [*10*]: random.randrange(5,2)

ValueError: empty range for randrange() (5,2, -3)
I like the exception idea best -- but backward compatibility and all that.

-CHB



-- 

Christopher Barker, Ph.D.
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Chris.Barker at noaa.gov
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