Joining arrays
We can join arrays using concatenate() to their axes.
a = np.array([[1,2], [3,4]])
b = np.array([[5,6], [7,8]])
x = np.concatenate((a,b), axis=0)
print(x)
"""
[[1 2]
[3 4]
[5 6]
[7 8]]
"""
x = np.concatenate((a,b), axis=1)
print(x)
"""
[[1 2 5 6]
[3 4 7 8]]
"""
stack() joins them to a new axis.
x = np.stack((a,b), axis=0)
print(x)
"""
[[[1 2]
[3 4]]
[[5 6]
[7 8]]]
"""
x = np.stack((a,b), axis=1)
print(x)
"""
[[[1 2]
[5 6]]
[[3 4]
[7 8]]]
"""