Python polyroots Exemples

Exemple #1

def invertibleroots(ma):
    import numpy.polynomial as poly
    pr = poly.polyroots(ma)
    insideroots = np.abs(pr) < 1
    if insideroots.any():
        pr[np.abs(pr) < 1] = 1. / pr[np.abs(pr) < 1]
        pnew = poly.Polynomial.fromroots(pr)
        mainv = pn.coef / pnew.coef[0]
        wasinvertible = False
    else:
        mainv = ma
        wasinvertible = True
    return mainv, wasinvertible

Exemple #2

Fichier : try_mlecov.py Projet : AnaMP/statsmodels

def invertibleroots(ma):
    import numpy.polynomial as poly
    pr = poly.polyroots(ma)
    insideroots = np.abs(pr)<1
    if insideroots.any():
        pr[np.abs(pr)<1] = 1./pr[np.abs(pr)<1]
        pnew = poly.Polynomial.fromroots(pr)
        mainv = pn.coef/pnew.coef[0]
        wasinvertible = False
    else:
        mainv = ma
        wasinvertible = True
    return mainv, wasinvertible