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Classe « PPoly »

Méthode scipy.interpolate.PPoly.solve

Signature de la méthode solve

def solve(self, y=0.0, discontinuity=True, extrapolate=None) 

Description

help(PPoly.solve)

Find real solutions of the equation ``pp(x) == y``.

Parameters
----------
y : float, optional
    Right-hand side. Default is zero.
discontinuity : bool, optional
    Whether to report sign changes across discontinuities at
    breakpoints as roots.
extrapolate : {bool, 'periodic', None}, optional
    If bool, determines whether to return roots from the polynomial
    extrapolated based on first and last intervals, 'periodic' works
    the same as False. If None (default), use `self.extrapolate`.

Returns
-------
roots : ndarray
    Roots of the polynomial(s).

    If the PPoly object describes multiple polynomials, the
    return value is an object array whose each element is an
    ndarray containing the roots.

Notes
-----
This routine works only on real-valued polynomials.

If the piecewise polynomial contains sections that are
identically zero, the root list will contain the start point
of the corresponding interval, followed by a ``nan`` value.

If the polynomial is discontinuous across a breakpoint, and
there is a sign change across the breakpoint, this is reported
if the `discont` parameter is True.

Examples
--------

Finding roots of ``[x**2 - 1, (x - 1)**2]`` defined on intervals
``[-2, 1], [1, 2]``:

>>> import numpy as np
>>> from scipy.interpolate import PPoly
>>> pp = PPoly(np.array([[1, -4, 3], [1, 0, 0]]).T, [-2, 1, 2])
>>> pp.solve()
array([-1.,  1.])

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