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Module « numpy.matlib »

Fonction ix_ - module numpy.matlib

Signature de la fonction ix_

def ix_(*args) 

Description

help(numpy.matlib.ix_)

Construct an open mesh from multiple sequences.

This function takes N 1-D sequences and returns N outputs with N
dimensions each, such that the shape is 1 in all but one dimension
and the dimension with the non-unit shape value cycles through all
N dimensions.

Using `ix_` one can quickly construct index arrays that will index
the cross product. ``a[np.ix_([1,3],[2,5])]`` returns the array
``[[a[1,2] a[1,5]], [a[3,2] a[3,5]]]``.

Parameters
----------
args : 1-D sequences
    Each sequence should be of integer or boolean type.
    Boolean sequences will be interpreted as boolean masks for the
    corresponding dimension (equivalent to passing in
    ``np.nonzero(boolean_sequence)``).

Returns
-------
out : tuple of ndarrays
    N arrays with N dimensions each, with N the number of input
    sequences. Together these arrays form an open mesh.

See Also
--------
ogrid, mgrid, meshgrid

Examples
--------
>>> import numpy as np
>>> a = np.arange(10).reshape(2, 5)
>>> a
array([[0, 1, 2, 3, 4],
       [5, 6, 7, 8, 9]])
>>> ixgrid = np.ix_([0, 1], [2, 4])
>>> ixgrid
(array([[0],
       [1]]), array([[2, 4]]))
>>> ixgrid[0].shape, ixgrid[1].shape
((2, 1), (1, 2))
>>> a[ixgrid]
array([[2, 4],
       [7, 9]])

>>> ixgrid = np.ix_([True, True], [2, 4])
>>> a[ixgrid]
array([[2, 4],
       [7, 9]])
>>> ixgrid = np.ix_([True, True], [False, False, True, False, True])
>>> a[ixgrid]
array([[2, 4],
       [7, 9]])

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