Merge two numpy array's of different shape into a single array

Question

I have two numpy array's a and b of length 53 and 82 respectively. I would like to merge them into a single array because I want to use the 53+82=135 length array say call it c for plotting.

I tried

c = a+b 

but I am getting ValueError: shape mismatch: objects cannot be broadcast to a single shape

Is this possible?

Answer 1

You need to use numpy.concatenate instead of array addition

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

Implementation

import numpy as np
a = np.arange(53)
b = np.arange(82)
c = np.concatenate((a, b))

Output

c.shape
(135, )

Answer 2

Use numpy.concatenate :

In [5]: import numpy as np

In [6]: a = np.arange(5)                                                                         

In [7]: b = np.arange(11)                                                                        

In [8]: np.concatenate((a, b))                                                                   
Out[8]: array([ 0,  1,  2,  3,  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10])

For 1-D arrays you can also use numpy.hstack :

In [9]: np.hstack((a, b))                                                                       
Out[9]: array([ 0,  1,  2,  3,  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10]