numpy.polynomial.polynomial.Polynomial.fromroots — NumPy v1.13 Manual (original) (raw)
Polynomial. fromroots(roots, domain=[], window=None)[source]¶
Return series instance that has the specified roots.
Returns a series representing the product(x - r[0])*(x - r[1])*...*(x - r[n-1]), where r is a list of roots.
| Parameters: | roots : array_like List of roots. domain : {[], None, array_like}, optional Domain for the resulting series. If None the domain is the interval from the smallest root to the largest. If [] the domain is the class domain. The default is []. window : {None, array_like}, optional Window for the returned series. If None the class window is used. The default is None. |
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| Returns: | new_series : series Series with the specified roots. |