The "backward", "forward" values were added.

    Returns
    -------
    out : complex ndarray
        The truncated or zero-padded input, transformed along the axes
        indicated by `axes`, or the last two axes if `axes` is not given.

    Raises
    ------
    ValueError
        If `s` and `axes` have different length, or `axes` not given and
        ``len(s) != 2``.
    IndexError
        If an element of `axes` is larger than than the number of axes of `a`.

    See Also
    --------
    numpy.fft : Overall view of discrete Fourier transforms, with definitions
         and conventions used.
    ifft2 : The inverse two-dimensional FFT.
    fft : The one-dimensional FFT.
    fftn : The *n*-dimensional FFT.
    fftshift : Shifts zero-frequency terms to the center of the array.
        For two-dimensional input, swaps first and third quadrants, and second
        and fourth quadrants.

    Notes
    -----
    `fft2` is just `fftn` with a different default for `axes`.

    The output, analogously to `fft`, contains the term for zero frequency in
    the low-order corner of the transformed axes, the positive frequency terms
    in the first half of these axes, the term for the Nyquist frequency in the
    middle of the axes and the negative frequency terms in the second half of
    the axes, in order of decreasingly negative frequency.

    See `fftn` for details and a plotting example, and `numpy.fft` for
    definitions and conventions used.


    Examples
    --------
    >>> a = np.mgrid[:5, :5][0]
    >>> np.fft.fft2(a)
    array([[ 50.0 +0.j        ,   0.0 +0.j        ,   0.0 +0.j        ,
              0.0 +0.j        ,   0.0 +0.j        ],
           [-12.5+17.20477401j,   0.0 +0.j        ,   0.0 +0.j        ,
              0.0 +0.j        ,   0.0 +0.j        ],
           [-12.5 +4.0614962j ,   0.0 +0.j        ,   0.0 +0.j        ,
              0.0 +0.j        ,   0.0 +0.j        ],
           [-12.5 -4.0614962j ,   0.0 +0.j        ,   0.0 +0.j        ,
                0.0 +0.j        ,   0.0 +0.j        ],
           [-12.5-17.20477401j,   0.0 +0.j        ,   0.0 +0.j        ,
              0.0 +0.j        ,   0.0 +0.j        ]])

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