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Module « numpy.matlib »

Fonction rollaxis - module numpy.matlib

Signature de la fonction rollaxis

def rollaxis(a, axis, start=0) 

Description

help(numpy.matlib.rollaxis)

Roll the specified axis backwards, until it lies in a given position.

This function continues to be supported for backward compatibility, but you
should prefer `moveaxis`. The `moveaxis` function was added in NumPy
1.11.

Parameters
----------
a : ndarray
    Input array.
axis : int
    The axis to be rolled. The positions of the other axes do not
    change relative to one another.
start : int, optional
    When ``start <= axis``, the axis is rolled back until it lies in
    this position. When ``start > axis``, the axis is rolled until it
    lies before this position. The default, 0, results in a "complete"
    roll. The following table describes how negative values of ``start``
    are interpreted:

    .. table::
       :align: left

       +-------------------+----------------------+
       |     ``start``     | Normalized ``start`` |
       +===================+======================+
       | ``-(arr.ndim+1)`` | raise ``AxisError``  |
       +-------------------+----------------------+
       | ``-arr.ndim``     | 0                    |
       +-------------------+----------------------+
       | |vdots|           | |vdots|              |
       +-------------------+----------------------+
       | ``-1``            | ``arr.ndim-1``       |
       +-------------------+----------------------+
       | ``0``             | ``0``                |
       +-------------------+----------------------+
       | |vdots|           | |vdots|              |
       +-------------------+----------------------+
       | ``arr.ndim``      | ``arr.ndim``         |
       +-------------------+----------------------+
       | ``arr.ndim + 1``  | raise ``AxisError``  |
       +-------------------+----------------------+

    .. |vdots|   unicode:: U+22EE .. Vertical Ellipsis

Returns
-------
res : ndarray
    For NumPy >= 1.10.0 a view of `a` is always returned. For earlier
    NumPy versions a view of `a` is returned only if the order of the
    axes is changed, otherwise the input array is returned.

See Also
--------
moveaxis : Move array axes to new positions.
roll : Roll the elements of an array by a number of positions along a
    given axis.

Examples
--------
>>> import numpy as np
>>> 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)

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