Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1469 by smichr: "can't decompose" error
http://code.google.com/p/sympy/issues/detail?id=1469
With x, a, b and c defined as symbols, factoring the following works:
###
>>> factor(a+b*x+c*x,x)
a + x*(b + c)
###
But if that c is changed to log(c) or 1/c (a power with a negative
exponent) then the factoring fails.
###
>>> factor(a+b*x+log(c)*x,x)
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
File "C:\Documents and Settings\chris\sympy\sympy\polys\factortools.py",
line 80, in factor
coeff, factors = poly_factors(f, *symbols, **flags)
File "C:\Documents and Settings\chris\sympy\sympy\polys\factortools.py",
line 36, in poly_factors
F = Poly(f, *symbols)
File "C:\Documents and Settings\chris\sympy\sympy\polys\polynomial.py",
line 389, in __new__
terms = Poly._decompose(poly.as_basic(), *symbols)
File "C:\Documents and Settings\chris\sympy\sympy\polys\polynomial.py",
line 545, in _decompose
raise PolynomialError("Can't decompose %s" % factor)
PolynomialError: Can't decompose log(c)
###
Is there any reason that the factoring couldn't just treat offending terms
like symbols? What is the reason that only raw symbols are allowed?
/c
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