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Module « numpy »

Fonction dstack - module numpy

Signature de la fonction dstack

def dstack(tup) 

Description

help(numpy.dstack)

Stack arrays in sequence depth wise (along third axis).

This is equivalent to concatenation along the third axis after 2-D arrays
of shape `(M,N)` have been reshaped to `(M,N,1)` and 1-D arrays of shape
`(N,)` have been reshaped to `(1,N,1)`. Rebuilds arrays divided by
`dsplit`.

This function makes most sense for arrays with up to 3 dimensions. For
instance, for pixel-data with a height (first axis), width (second axis),
and r/g/b channels (third axis). The functions `concatenate`, `stack` and
`block` provide more general stacking and concatenation operations.

Parameters
----------
tup : sequence of arrays
    The arrays must have the same shape along all but the third axis.
    1-D or 2-D arrays must have the same shape.

Returns
-------
stacked : ndarray
    The array formed by stacking the given arrays, will be at least 3-D.

See Also
--------
concatenate : Join a sequence of arrays along an existing axis.
stack : Join a sequence of arrays along a new axis.
block : Assemble an nd-array from nested lists of blocks.
vstack : Stack arrays in sequence vertically (row wise).
hstack : Stack arrays in sequence horizontally (column wise).
column_stack : Stack 1-D arrays as columns into a 2-D array.
dsplit : Split array along third axis.

Examples
--------
>>> import numpy as np
>>> a = np.array((1,2,3))
>>> b = np.array((2,3,4))
>>> np.dstack((a,b))
array([[[1, 2],
        [2, 3],
        [3, 4]]])

>>> a = np.array([[1],[2],[3]])
>>> b = np.array([[2],[3],[4]])
>>> np.dstack((a,b))
array([[[1, 2]],
       [[2, 3]],
       [[3, 4]]])

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