Concatenate Simple

import numpy as np

a = np.array([
    [1, 2, 4],
    [11, 22, 34],
    [2, 5, 7]
])

a.shape

(3, 3)

b = np.array([
    [19, 18, 16],
    [9, -2, -14],
    [18, 15, 13]
])

b.shape

(3, 3)

c = np.concatenate(a, b)

---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

<ipython-input-20-9fadeb0cc951> in <module>()
----> 1 c = np.concatenate(a, b)


TypeError: only integer scalar arrays can be converted to a scalar index

# The above line is throwing an issue because it is passed as an argument instead of sequence of argument. The arrays you want to concatenate need to passed in as a sequence, not as separate arguments.

c = np.concatenate((a, b))

c

array([[  1,   2,   4],
       [ 11,  22,  34],
       [  2,   5,   7],
       [ 19,  18,  16],
       [  9,  -2, -14],
       [ 18,  15,  13]])

c.shape

(6, 3)

# Concatenate column level
d = np.concatenate((a, b), axis=1)

d

array([[  1,   2,   4,  19,  18,  16],
       [ 11,  22,  34,   9,  -2, -14],
       [  2,   5,   7,  18,  15,  13]])

d.shape

(3, 6)