Stack arrays in sequence vertically (row wise).
This is equivalent to concatenation along the first axis after 1-D arrays
of shape (N,) have been reshaped to (1,N). Rebuilds arrays divided by
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
block provide more general stacking and concatenation operations.
The arrays must have the same shape along all but the first axis. 1-D arrays must have the same length.
The array formed by stacking the given arrays, will be at least 2-D.
Join a sequence of arrays along a new axis.
Stack arrays in sequence horizontally (column wise).
Stack arrays in sequence depth wise (along third dimension).
Join a sequence of arrays along an existing axis.
Split array into a list of multiple sub-arrays vertically.
Assemble arrays from blocks.
>>> a = np.array([1, 2, 3]) >>> b = np.array([2, 3, 4]) >>> np.vstack((a,b)) array([[1, 2, 3], [2, 3, 4]])
>>> a = np.array([, , ]) >>> b = np.array([, , ]) >>> np.vstack((a,b)) array([, , , , , ])