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

[Sebastian Berg]

On Di, 2014-02-18 at 09:05 -0700, Charles R Harris wrote:
> Hi All,
> 
> 
> There is an old ticket, #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.
> 
>     Parameters
>     ----------
>     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'
> 
> 
>     Examples
>     --------
>     >>> 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?
> 

Just to note, there have been similar proposals with a rolling_window
function. It could be made ND aware, too (though maybe this one is
also).

> 
> Chuck
> 
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