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numpy.rollaxis(a, axis, start=0)
[source] -
Roll the specified axis backwards, until it lies in a given position.
Parameters: a : ndarray
Input array.
axis : int
The axis to roll backwards. The positions of the other axes do not change relative to one another.
start : int, optional
The axis is rolled until it lies before this position. The default, 0, results in a ?complete? roll.
Returns: res : ndarray
For Numpy >= 1.10 a view of
a
is always returned. For earlier Numpy versions a view ofa
is returned only if the order of the axes is changed, otherwise the input array is returned.See also
Examples
>>> a = np.ones((3,4,5,6)) >>> np.rollaxis(a, 3, 1).shape (3, 6, 4, 5) >>> np.rollaxis(a, 2).shape (5, 3, 4, 6) >>> np.rollaxis(a, 1, 4).shape (3, 5, 6, 4)
numpy.rollaxis()
2017-01-10 18:18:33
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