Hi,
I have : Python 3.4.2 (v3.4.2:ab2c023a9432, Oct 6 2014, 22:15:05) [MSC
v.1600 32 bit (Intel)] on win32
Le mardi 19 mai 2015 18:25:33 UTC+2, Aaron Meurer a écrit :
>
> What version of SymPy is this? On master I get
>
> In [1]: x = symbols('x', real=True)
>
> In [2]: f = Lambda(x, 2*sqrt(x)*sqrt(x**3 - x**2 + 1) + 2*x**3 - x**2
> + x*sqrt(x**3 - x**2 + 1) + 2*x**1.5 + 2*x**2.5*sqrt(x**3 - x**2 + 1)
> - 3*x**2.5 - 4*x**3.5*sqrt(x**3 - x**2 + 1) - 2*x**3.5 + 5*x**4.5 -
> 3*x**5.5 - 1)
>
> In [3]: solve(f(x), x)
> Out[3]: [0.149910458676117, 1.0]
>
> (note that it takes a while)
>
> Aaron Meurer
>
>
> On Tue, May 19, 2015 at 6:29 AM, Arnaud Usciati <[email protected]
> <javascript:>> wrote:
> > Hello,
> >
> > I tried to find the roots of : 2*sqrt(x)*sqrt(x**3 - x**2 + 1) + 2*x**3
> -
> > x**2 + x*sqrt(x**3 - x**2 + 1) + 2*x**1.5 + 2*x**2.5*sqrt(x**3 - x**2 +
> 1) -
> > 3*x**2.5 - 4*x**3.5*sqrt(x**3 - x**2 + 1) - 2*x**3.5 + 5*x**4.5 -
> 3*x**5.5 -
> > 1 = 0.
> >
> > x = symbols('x', real=True)
> > f = Lambda(x, 2*sqrt(x)*sqrt(x**3 - x**2 + 1) + 2*x**3 - x**2 +
> x*sqrt(x**3
> > - x**2 + 1) + 2*x**1.5 + 2*x**2.5*sqrt(x**3 - x**2 + 1) - 3*x**2.5 -
> > 4*x**3.5*sqrt(x**3 - x**2 + 1) - 2*x**3.5 + 5*x**4.5 - 3*x**5.5 - 1)
> >
> > Input : solve(f(x), x)
> > Output : [0.149910458676117, 0.865324593883105, 1.00000000000000,
> > 1.24896947842683, 2.56371129870321, 3.02429035798029]
> >
> > But only 0.149910458676117 and 1 are really roots :
> > f(0.865324593883105) = 0.735269457206734
> > f(1.24896947842683) = -4.09736628717860
> > f(2.56371129870321) = -509.709822051607
> > f(3.02429035798029) = -1361.51149028959
> >
> > Arnaud,
> >
> > Python 3.4.2 (v3.4.2:ab2c023a9432, Oct 6 2014, 22:15:05) [MSC v.1600 32
> bit
> > (Intel)] on win32
> >
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