#4622: Bug in variety()
---------------------------------+------------------------------------------
Reporter: SimonKing | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-3.2.1
Component: commutative algebra | Resolution:
Keywords: variety triang.lib |
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Comment (by mabshoff):
Another, simpler example by Alex:
{{{
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| Sage Version 3.2, Release Date: 2008-11-20 |
| Type notebook() for the GUI, and license() for information. |
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sage: R.<w>= PolynomialRing(QQ,1)
sage: H=w
sage: I= ideal(H); I
Ideal (w) of Multivariate Polynomial Ring in w over Rational Field
sage: I.variety()
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/Users/arai021/<ipython console> in <module>()
/Applications/sage/local/lib/python2.5/site-packages/sage/rings/
polynomial/multi_polynomial_ideal.pyc in variety(self, ring)
1528 P = self.ring()
1529 if ring is not None: P = P.change_ring(ring)
-> 1530 T = self.triangular_decomposition
('singular:triangLfak')
1531
1532 V = []
/Applications/sage/local/lib/python2.5/site-packages/sage/rings/
polynomial/multi_polynomial_ideal.pyc in triangular_decomposition
(self, algorithm, singular)
740 P = self.ring()
741
--> 742 is_groebner = self.basis_is_groebner()
743
744 # make sure to work w.r.t. 'lex'
/Applications/sage/local/lib/python2.5/site-packages/sage/rings/
polynomial/multi_polynomial_ideal.pyc in basis_is_groebner(self,
singular)
1237 self.ring()._singular_().set_ring()
1238
-> 1239 F = singular( self.gens(), "module" )
1240 LTF = singular( [f.lt() for f in self.gens()] ,
"module" )
1241
/Applications/sage/local/lib/python2.5/site-packages/sage/interfaces/
singular.pyc in __call__(self, x, type)
591 x = str(x)[1:-1]
592
--> 593 return SingularElement(self, type, x, False)
594
595
/Applications/sage/local/lib/python2.5/site-packages/sage/interfaces/
singular.pyc in __init__(self, parent, type, value, is_name)
1007 except (RuntimeError, TypeError,
KeyboardInterrupt), x:
1008 self._session_number = -1
-> 1009 raise TypeError, x
1010 else:
1011 self._name = value
TypeError: Singular error:
? error occurred in STDIN line 23: `module sage4=w,;`
? expected module-expression. type 'help module;'
? last reserved name was `module`
error at token `;`
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4622#comment:1>
Sage <http://sagemath.org/>
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