is_Real checks if it is an instance of the Real class, which is not
what you want (this property is deprecated anyway).
is_real on Interval means something completely different. It means the
interval is a real interval, whereas everywhere else it x.is_real
means that x is a real number.
Aaron Meurer
On Sat, Nov 2, 2013 at 10:52 AM, Alexander Birukov <sanya....@gmail.com> wrote:
>
> Thanks for the tip. I've tried .is_Real (capital one), because as IDE says
> it's basic method, while .is_real related to Interval. That's why I didnt
> even try it
>
> In my opinion, x = Symbol('x', real=True) makes it way better to control and
> read, so I'll stick to it.
>
> суббота, 2 ноября 2013 г., 20:31:39 UTC+4 пользователь Aaron Meurer написал:
>>
>> The issue is that the second and third solution give None, which means
>> it doesn't know (there's really no good reason for this, but you
>> generally have to look out for that). Really, those solutions should
>> be complex.
>>
>> The attribute you want is is_real.
>>
>> Another thing you can do is to set x to be real. If you do that, solve
>> will filter out the solutions automatically
>>
>> In [52]: x = Symbol('x', real=True)
>>
>> In [53]: print(solve(x**3 - 4, x))
>> [2**(2/3)]
>>
>> Aaron Meurer
>>
>> On Sat, Nov 2, 2013 at 10:17 AM, Alexander Birukov <sany...@gmail.com>
>> wrote:
>> > Hello everyone. I have another question, and as topic name says: how can
>> > I
>> > sort return of solve, so complex numbers wont be in anymore?
>> >
>> > I've seached in flags for it, but no luck, and then I've played with
>> > .is_*
>> > attributes and got something wierd(?):
>> >
>> > sols = solve(x**3 - 4)
>> > sols = [sol for sol in sols if sol.is_complex]
>> >
>> > sols before filtering:
>> > [2**(2/3), -2**(2/3)/2 - 2**(2/3)*sqrt(3)*I/2, -2**(2/3)/2 +
>> > 2**(2/3)*sqrt(3)*I/2]
>> >
>> > after:
>> > 2**(2/3)
>> >
>> > Question is why and does that code always gives me what I want? (Just
>> > confused about why is_complex returns True for real, and False for
>> > exactly
>> > complex number).
>> >
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