I bisected it down to this commit:
2686805263d86639420ae56414666d38f0efaa8c is the first bad commit
commit 2686805263d86639420ae56414666d38f0efaa8c
Author: Mateusz Paprocki <[email protected]>
Date: Sun Mar 14 21:18:04 2010 +0100
Fixed and improved solve(x**4 + x**3 + x**2 + x + 1)
:040000 040000 76beac15724bf74859d6a156f965434016a29680
e7e966361cfd8b1fefaa96fbc2430ab8f234d6ad M sympy
Hope that helps.
Aaron Meurer
On Mar 20, 2010, at 3:25 PM, Ondrej Certik wrote:
> Hi Mateusz,
>
> what is the way to use solve with floating point coefficients, e.g.
> this used to work:
>
> In [1]: solve(x**2+x+1, x)
> Out[1]:
> ⎡ ⎽⎽⎽ ⎽⎽⎽⎤
> ⎢ ⅈ⋅╲╱ 3 ⅈ⋅╲╱ 3 ⎥
> ⎢-1/2 - ───────, -1/2 + ───────⎥
> ⎣ 2 2 ⎦
>
> In [2]: solve(x**2+x+1.0, x)
> Out[2]: [-1/2 - 0.866025403784439⋅ⅈ, -1/2 + 0.866025403784439⋅ⅈ]
>
>
> But now it doesn't:
>
> In [1]: solve(x**2+x+1, x)
> Out[1]:
> ⎡ ⎽⎽⎽ ⎽⎽⎽⎤
> ⎢ ⅈ⋅╲╱ 3 ⅈ⋅╲╱ 3 ⎥
> ⎢-1/2 - ───────, -1/2 + ───────⎥
> ⎣ 2 2 ⎦
>
> In [2]: solve(x**2+x+1.0, x)
> ---------------------------------------------------------------------------
> DomainError Traceback (most recent call last)
>
> /home/ondrej/repos/sympy/<ipython console> in <module>()
>
> /home/ondrej/repos/sympy/sympy/solvers/solvers.pyc in solve(f,
> *symbols, **flags)
> 237 if poly.degree > 2:
> 238 flags['simplified'] = flags.get('simplified', False)
> --> 239 result = roots(poly, cubics=True, quartics=True).keys()
> 240
> 241 elif strategy == GS_RATIONAL:
>
> /home/ondrej/repos/sympy/sympy/polys/polyroots.pyc in roots(f, *gens, **flags)
> 326 raise PolynomialError('multivariate polynomials
> are not supported')
> 327
> --> 328 f, x = f.to_field(), f.gen
> 329
> 330 def _update_dict(result, root, k):
>
> /home/ondrej/repos/sympy/sympy/polys/polytools.pyc in to_field(f)
> 771 """Make the ground domain a field. """
> 772 try:
> --> 773 result = f.rep.to_field()
> 774 except AttributeError: # pragma: no cover
> 775 raise OperationNotSupported(f, 'to_field')
>
> /home/ondrej/repos/sympy/sympy/polys/polyclasses.pyc in to_field(f)
> 1151 def to_field(f):
> 1152 """Make the ground domain a field. """
> -> 1153 return f.convert(f.dom.get_field())
> 1154
> 1155 def convert(f, dom):
>
> /home/ondrej/repos/sympy/sympy/polys/algebratools.pyc in get_field(self)
> 1186 def get_field(self):
> 1187 """Returns a field associated with `self`. """
> -> 1188 raise DomainError('there is no field associated with %s' %
> self)
> 1189
> 1190 def get_exact(self):
>
> DomainError: there is no field associated with RR
>
>
> We need to fix this.
>
> Ondrej
>
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