On Mon, Jul 21, 2008 at 08:12:42PM +0200, Ondrej Certik wrote:
>
> Hi,
>
> when I was at high school I remember figuring out how to factor this:
>
> In [1]: 2*x*y*z + x*y**2 + x*z**2 + y*x**2 + y*z**2 + z*x**2 + z*y**2
> Out[1]:
> 2 2 2 2 2 2
> 2*x*y*z + x*y + x*z + y*x + y*z + z*x + z*y
>
>
> If you don't know the result, which you don't, it's actually pretty
> difficult. It took us couple hours with friens. Well, in pure Python
> you can do just this:
>
> In [2]: %time factor(_)
> CPU times: user 2.66 s, sys: 0.00 s, total: 2.66 s
> Wall time: 2.67 s
> Out[3]: (x + y)*(y + z)*(x + z)
>
> Not bad. However the time varies a lot on my laptop if I repeat it in
> another ipython session -- from 0.7s (!) to 8s. Can anyone verify this
> please? You need the latest hg sympy. Why is that?
Confirmed on 5d890816b79a. The time varies even in the same ipython
session.
--
Всего хорошего, Кирилл.
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