For the lag polynomials I have cases where the order is zero, but
roots raises a ValueError.
Is this intended?
Then, I need to catch it in my code. I haven't checked yet if my other
parts will go through with empty roots.
>>> np.polynomial.Polynomial([1])
Polynomial([ 1.], [-1., 1.])
>>> np.polynomial.Polynomial([1]).roots()
Traceback (most recent call last):
File "<pyshell#140>", line 1, in <module>
np.polynomial.Polynomial([1]).roots()
File "<string>", line 485, in roots
File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py",
line 280, in mapdomain
[x] = as_series([x], trim=False)
File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py",
line 137, in as_series
raise ValueError("Coefficient array is empty")
ValueError: Coefficient array is empty
Josef
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