linalg.py 文件源码

def dctii(x, axes=None):
    """
    Compute a multi-dimensional DCT-II over specified array axes. This
    function is implemented by calling the one-dimensional DCT-II
    :func:`scipy.fftpack.dct` with normalization mode 'ortho' for each
    of the specified axes.

    Parameters
    ----------
    a : array_like
      Input array
    axes : sequence of ints, optional (default None)
      Axes over which to compute the DCT-II.

    Returns
    -------
    y : ndarray
      DCT-II of input array
    """

    if axes is None:
        axes = list(range(x.ndim))
    for ax in axes:
        x = fftpack.dct(x, type=2, axis=ax, norm='ortho')
    return x