Andy Ray Terrel wrote:
> Quite strange indeed.
>
> On my Mac Python 2.7, sympy.__version__ = 0.6.7 I get:
>
> In [17]: expr = (2.1 - 2.1*y**2 + 2*x)/x**3
>
> In [18]: sympy.simplify(expr)
> Out[18]: -inf
>
This raises an error for me:
raise ValueError("can't raise polynomial to a negative power")
ValueError: can't raise polynomial to a negative power
But if I nsimplify(..., rational=True) everthing works ok:
h[12] >>> e1= (2.1 - 2.1*y**2 + 2*x)/x**3
h[12] >>> e2= (2.1*x*(1-y)**2+2*y*x)/ x**3
h[12] >>> e3= (sympy.Rational(21,10)*x*(1-y)**2 + 2*y*x) / X**3
h[12] >>> for e in [e1,e2,e3]:
... print simplify(nsimplify(e,rational=True))
...
(20*x - 21*y**2 + 21)/(10*x**3)
(21*y**2 - 22*y + 21)/(10*x**2)
x*(21*y**2 - 22*y + 21)/(10*X**3)
CAUTION: you used an X instead of an x in the last equation.
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