Hi Adh,
On Sat, Jan 19, 2008 at 03:20:36PM -0800, [EMAIL PROTECTED] wrote:
>
> In [15]: x, y, z = symbols('xyz', real=True)
>
> In [16]: exp(I*x).expand(complex=True)
> Out[16]: I*sin(x) + cos(x)
>
> In [17]: re(_)
> Out[17]: re(cos(x))
>
> In [18]: im(__)
> Out[18]: im(cos(x)) + sin(x)
>
> Obviously the output should have been cos(x) and sin(x) respectively.
Thanks for reporting it!
> I created an issuse for this
> http://code.google.com/p/sympy/issues/detail?id=644
Replied there. Basicaly your patch is ok and welcomed, but could you
please write tests?
> Adding simple _eval_is_real for cos, tan, cot, atan, acot works but
> for asin and acos, the domain is [-1,1]. I am wondering if SymPy
> currently features assumption to limit a variable's range just as we
> can assume it to be real, so that a variable x can be defined as real
> in the range [-1,1].
At present, no.
However, some time ago, there was an idea to base assumption model on
intervals:
http://code.google.com/p/sympy/issues/detail?id=398
--
Всего хорошего, Кирилл.
http://landau.phys.spbu.ru/~kirr/aiv/
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