[Numpy-discussion] New (old) function proposal.

Charles R Harris charlesr.harris at gmail.com
Tue Feb 18 11:05:30 EST 2014

Hi All,

There is an old ticket, #1499 <https://github.com/numpy/numpy/issues/1499>,
that suggest adding a segment_axis function.

def segment_axis(a, length, overlap=0, axis=None, end='cut', endvalue=0):
    """Generate a new array that chops the given array along the given axis
    into overlapping frames.

    a : array-like
        The array to segment
    length : int
        The length of each frame
    overlap : int, optional
        The number of array elements by which the frames should overlap
    axis : int, optional
        The axis to operate on; if None, act on the flattened array
    end : {'cut', 'wrap', 'end'}, optional
        What to do with the last frame, if the array is not evenly
        divisible into pieces.

            - 'cut'   Simply discard the extra values
            - 'wrap'  Copy values from the beginning of the array
            - 'pad'   Pad with a constant value

    endvalue : object
        The value to use for end='pad'

    >>> segment_axis(arange(10), 4, 2)
    array([[0, 1, 2, 3],
           [2, 3, 4, 5],
           [4, 5, 6, 7],
           [6, 7, 8, 9]])

Is there and interest in having this function available?

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