Module « scipy.special »

Fonction erfcinv - module scipy.special

Signature de la fonction erfcinv

Description

erfcinv.__doc__

erfcinv(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj])

Inverse of the complementary error function.

    Computes the inverse of the complementary error function.

    In the complex domain, there is no unique complex number w satisfying
    erfc(w)=z. This indicates a true inverse function would have multi-value.
    When the domain restricts to the real, 0 < x < 2, there is a unique real
    number satisfying erfc(erfcinv(x)) = erfcinv(erfc(x)).

    It is related to inverse of the error function by erfcinv(1-x) = erfinv(x)

    Parameters
    ----------
    y : ndarray
        Argument at which to evaluate. Domain: [0, 2]

    Returns
    -------
    erfcinv : ndarray
        The inverse of erfc of y, element-wise

    See Also
    --------
    erf : Error function of a complex argument
    erfc : Complementary error function, ``1 - erf(x)``
    erfinv : Inverse of the error function

    Examples
    --------
    1) evaluating a float number

    >>> from scipy import special
    >>> special.erfcinv(0.5)
    0.4769362762044698

    2) evaluating an ndarray

    >>> from scipy import special
    >>> y = np.linspace(0.0, 2.0, num=11)
    >>> special.erfcinv(y)
    array([        inf,  0.9061938 ,  0.59511608,  0.37080716,  0.17914345,
           -0.        , -0.17914345, -0.37080716, -0.59511608, -0.9061938 ,
                  -inf])