Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1332 by Comer.Duncan: problem with eigenvalue example
http://code.google.com/p/sympy/issues/detail?id=1332
I am using isympy on my Debian etch system.I have tried running the example
where one specifies a matrix and constructs the characteristic polynomial.
The result is given in the form:
f = Poly(x**3 - 8*x**2 + 17*x - 10, x)
When I from sympy.polynomials import roots and try
r= roots(f,x)
I get a failure:
Traceback (most recent call last):
File "<console>", line 1, in ?
File "/home/comer/sympy-0.6.3/sympy/polynomials/roots_.py", line 284, in
roots
f = Polynomial(f, var=var, order=None)
File "/home/comer/sympy-0.6.3/sympy/polynomials/base.py", line 127, in
__new__
obj.coeffs = sympy2coefficients(sympy_expr, var, order)
File "/home/comer/sympy-0.6.3/sympy/polynomials/base.py", line 794, in
sympy2coefficients
raise PolynomialException("%s is not a polynomial!"
PolynomialException: Poly(x**3 - 8*x**2 + 17*x - 10, x) is not a polynomial!
However, if first I set g = x**3 -8*x**2 +17*x -10 and then try
r = roots(g,x) I get the predicted answer.
It thus seems that the assignment of Poly( x**3 -8*x**2 +17*x -10) is the
problem. What am I missing or is there a bug?
Thanks.
Comer
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