andyl wrote:
> Hi
>
> I have been trying out sympy, working through the examples in the
> documentation. All went well, and was impressive, until I tried to
> factor polynomials. The example in the documentation was
>
> f = 4*x**4 + 8*x**3 + 77*x**2 + 18*x + 153
>
> and factor(f) gave (9 + 4*x**2)*(17 + 2*x + x**2) as expected.
>
> But then factor(f, gaussian=True) or factor(f, extension=I) should
> give according the documentation:
>
> 4*(x - 3*I/2)*(x + 3*I/2)*(x - 4*I + 1)*(x + 4*I + 1)
>
> Instead I get the same result as before, ie (9 + 4*x**2)*(17 + 2*x +
> x**2)
>
Make sure you use the flag gaussian=True not gaussian=1 (at least in the new
polys12 branch) since it's picky in that regard.
All in polys12:
h[2] >>> f = 4*x**4 + 8*x**3 + 77*x**2 + 18*x + 153
h[2] >>> factor(f)
(9 + 4*x**2)*(17 + 2*x + x**2)
h[3] >>> factor(f,gaussian=1)
(9 + 4*x**2)*(17 + 2*x + x**2)
h[3] >>> factor(f,gaussian=True)
4*(x - 3*I/2)*(x + 3*I/2)*(1 + x - 4*I)*(1 + x + 4*I)
h[4] >>> factor(f,extension=I)
4*(x - 3*I/2)*(x + 3*I/2)*(1 + x - 4*I)*(1 + x + 4*I)
h[4] >>> factor(6*x-10)
2*(-5 + 3*x)
/c
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