On Thu, Jan 6, 2011 at 2:14 AM, <josef.p...@gmail.com> wrote:
> just something I bumped into and wasn't aware of
>
>>>> aa
> array([ 1., 1., 1., 1., 1.])
>>>> aa.astype(int)
> array([0, 1, 0, 0, 0])
>>>> aa - 1
> array([ -2.22044605e-16, 2.22044605e-16, -2.22044605e-16,
> -3.33066907e-16, -3.33066907e-16])
>>>> np.round(aa).astype(int)
> array([1, 1, 1, 1, 1])
>> a = np.ones(100)
>> a.astype(int)
array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1])
My default numpy int is 64 bits. Try 32 bits:
>> a = np.ones(100, np.int32)
>> a.astype(int)
array([1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1])
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