#5639: minpoly of symbolic matrices is broken
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Reporter: was | Owner: mhansen
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.1.3
Component: calculus | Keywords:
Work_issues: | Author: Mike Hansen
Reviewer: | Merged:
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Comment(by jason):
I believe this shows the error more clearly, maybe:
{{{
sage: var('s,t')
(s, t)
sage: expr=t^2-2*s*t+1
sage: expr.expand()
-2*s*t + t^2 + 1
sage: expr.polynomial(None,ring=SR['t'])
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/jason/.sage/temp/littleone/25931/_home_jason__sage_init_sage_0.py in
<module>()
/home/jason/sage/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.polynomial
(sage/symbolic/expression.cpp:17284)()
/home/jason/sage/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.pyc in polynomial(ex,
base_ring, ring)
985 1.87813065119873*x^2 + 20.0855369231877
986 """
--> 987 converter = PolynomialConverter(ex, base_ring=base_ring,
ring=ring)
988 res = converter()
989 return converter.ring(res)
/home/jason/sage/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.pyc in __init__(self, ex,
base_ring, ring)
843 G = map(repr, ring.gens())
844 if any([repr(v) not in G for v in ex.variables()]):
--> 845 raise TypeError, "%s is not a variable of %s" %(v,
ring)
846 self.ring = ring
847 self.base_ring = ring.base_ring()
TypeError: t is not a variable of Univariate Polynomial Ring in t over
Symbolic Ring
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5639#comment:12>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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