_unfold(arr, axis, size, step)

All windows are of size size and begin with every step elements.

Parameters

arr : ndarray, shape (N_1, ..., N_k)

The input array

axis : int

Axis along which the windows are extracted

size : int

Size of the windows

step : int

Stride between first elements of subsequent windows.

Returns

ndarray, shape (N_1, ..., 1 + (N_axis-size)/step, ..., N_k, size)

Append an extra dimension containing sliding windows along axis.

Examples

>>> i, j = np.ogrid[:3,:7]
... a = i*10 + j
... a
array([[ 0,  1,  2,  3,  4,  5,  6],
       [10, 11, 12, 13, 14, 15, 16],
       [20, 21, 22, 23, 24, 25, 26]])

>>> _unfold(a, axis=1, size=3, step=2)
array([[[ 0,  1,  2],
        [ 2,  3,  4],
        [ 4,  5,  6]],
       [[10, 11, 12],
        [12, 13, 14],
        [14, 15, 16]],
       [[20, 21, 22],
        [22, 23, 24],
        [24, 25, 26]]])

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

matplotlib.cbook._unfold

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File: /matplotlib/cbook/__init__.py#1915
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