Module « scipy.stats »

Fonction hmean - module scipy.stats

Signature de la fonction hmean

def hmean(a, axis=0, dtype=None) 

Description

hmean.__doc__

Calculate the harmonic mean along the specified axis.

    That is:  n / (1/x1 + 1/x2 + ... + 1/xn)

    Parameters
    ----------
    a : array_like
        Input array, masked array or object that can be converted to an array.
    axis : int or None, optional
        Axis along which the harmonic mean is computed. Default is 0.
        If None, compute over the whole array `a`.
    dtype : dtype, optional
        Type of the returned array and of the accumulator in which the
        elements are summed. If `dtype` is not specified, it defaults to the
        dtype of `a`, unless `a` has an integer `dtype` with a precision less
        than that of the default platform integer. In that case, the default
        platform integer is used.

    Returns
    -------
    hmean : ndarray
        See `dtype` parameter above.

    See Also
    --------
    numpy.mean : Arithmetic average
    numpy.average : Weighted average
    gmean : Geometric mean

    Notes
    -----
    The harmonic mean is computed over a single dimension of the input
    array, axis=0 by default, or all values in the array if axis=None.
    float64 intermediate and return values are used for integer inputs.

    Use masked arrays to ignore any non-finite values in the input or that
    arise in the calculations such as Not a Number and infinity.

    Examples
    --------
    >>> from scipy.stats import hmean
    >>> hmean([1, 4])
    1.6000000000000001
    >>> hmean([1, 2, 3, 4, 5, 6, 7])
    2.6997245179063363