numpy.ma.dstack

ma.dstack(tup)[source]

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:

tupsequence 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:

stackedndarray

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.

Notes

The function is applied to both the _data and the _mask, if any.

Examples

Try it in your browser!

>>> import numpy as np
>>> a = np.array((1,2,3))
>>> b = np.array((4,5,6))
>>> np.dstack((a,b))
array([[[1, 4],
        [2, 5],
        [3, 6]]])

>>> a = np.array([[1],[2],[3]])
>>> b = np.array([[4],[5],[6]])
>>> np.dstack((a,b))
array([[[1, 4]],
       [[2, 5]],
       [[3, 6]]])

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