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

[G Young]

Of the methods defined in *numpy/mtrand.pyx* (excluding helper functions
and *random_integers*, as they are all related to *randint*), *randint* is
the only other function with *low* and *high* parameters.  However, it
enforces *high* > *low*.

Greg

On Tue, Jan 19, 2016 at 1:36 PM, Benjamin Root <ben.v.root at gmail.com> wrote:

> Are there other functions where this behavior may or may not be happening?
> If it isn't consistent across all np.random functions, it probably should
> be, one way or the other.
>
> Ben Root
>
> On Tue, Jan 19, 2016 at 5:10 AM, Jaime Fernández del Río <
> jaime.frio at gmail.com> wrote:
>
>> Hi all,
>>
>> There is a PR (#7026 <https://github.com/numpy/numpy/pull/7026>) that
>> documents the current behavior of np.random.uniform when the low and high
>> parameters it takes do not conform to the expected low < high. Basically:
>>
>>    - if low < high, random numbers are drawn from [low, high),
>>    - if low = high, all random numbers will be equal to low, and
>>    - if low > high, random numbers are drawn from (high, low] (notice
>>    the change in the open side of the interval.)
>>
>> My only worry is that, once we document this, we can no longer claim that
>> it is a bug.  So I would like to hear from others what do they think.  The
>> other more or less obvious options would be to:
>>
>>    - Raise an error, but this would require a deprecation cycle, as
>>    people may be relying on the current undocumented behavior.
>>    - Check the inputs and draw numbers from [min(low, high), max(low,
>>    high)), which is minimally different from current behavior.
>>
>> I will be merging the current documentation changes in the next few days,
>> so it would be good if any concerns were voiced before that.
>>
>> Thanks,
>>
>> Jaime
>>
>> --
>> (\__/)
>> ( O.o)
>> ( > <) Este es Conejo. Copia a Conejo en tu firma y ayúdale en sus planes
>> de dominación mundial.
>>
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