Status: Accepted
Owner: plaes800
Labels: Type-Defect Priority-Medium
New issue 1637 by plaes800: solve([Eq(x+a*y,1), Eq(x+y+z, 1), Eq(z+3*x)],
x, y, z, a) troubles
http://code.google.com/p/sympy/issues/detail?id=1637
In [38]: x, y, z, a = symbols('xyza')
In [39]: solve([Eq(x+a*y,1), Eq(x+y+z, 1), Eq(z+3*x)], x, y, z, a)
---------------------------------------------------------------------------
PolynomialError Traceback (most recent call last)
/home/plaes/code/sympy/<ipython console> in <module>()
/home/plaes/code/sympy/sympy/solvers/solvers.pyc in solve(f, *symbols,
**flags)
327 soln = solve_linear_system(matrix, *symbols,
**flags)
328 else:
--> 329 soln = solve_poly_system(polys)
330
331 # Use swap_dict to ensure we return the same type as
what was
/home/plaes/code/sympy/sympy/solvers/polysys.pyc in
solve_poly_system(system,
*symbols)
113 head, tail = f.unify_with(system)
114
--> 115 solutions = solve_reduced_system([head] + tail, True)
116
117 if solutions is None:
/home/plaes/code/sympy/sympy/solvers/polysys.pyc in
solve_reduced_system(system,
entry)
70 f = univariate.pop()
71 else:
---> 72 raise PolynomialError("Not a zero-dimensional system")
73
74 zeros = roots(Poly(f, f.symbols[-1])).keys()
PolynomialError: Not a zero-dimensional system
Maple gives following solutions:
x = x; a = -(x-1)/(2x+1) ; z = - 3x and y = 2x +1
Also (maybe I'm doing it wrong):
In [43]: print solve([Eq(x+a*y,1), Eq(x+y+z, 1), Eq(z+3*x)], x)
-------> print(solve([Eq(x+a*y,1), Eq(x+y+z, 1), Eq(z+3*x)], x))
None
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