Sympy python circumference

Posted by Mattia Villani on Stack Overflow See other posts from Stack Overflow or by Mattia Villani
Published on 2012-10-18T16:34:38Z Indexed on 2012/10/18 17:01 UTC
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python

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sympy

I need to display a circumference. In order to do that I thought I could calculata for a lot of x the two values of y, so I did:

import sympy as sy
from sympy.abc import x,y
f = x**2 + y**2 - 1
a = x - 0.5
sy.solve([f,a],[x,y])

and this is what I get:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/sympy/solvers/solvers.py", line 484, in
 solve
    solution = _solve(f, *symbols, **flags)
  File "/usr/lib/python2.7/dist-packages/sympy/solvers/solvers.py", line 749, in
 _solve
    result = solve_poly_system(polys)
  File "/usr/lib/python2.7/dist-packages/sympy/solvers/polysys.py", line 40, in
solve_poly_system
    return solve_biquadratic(f, g, opt)
  File "/usr/lib/python2.7/dist-packages/sympy/solvers/polysys.py", line 48, in
solve_biquadratic
    G = groebner([f, g])
  File "/usr/lib/python2.7/dist-packages/sympy/polys/polytools.py", line 5308, i
n groebner
    raise DomainError("can't compute a Groebner basis over %s" % domain)
DomainError: can't compute a Groebner basis over RR

How can I calculate the y's values ?

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