how to add columns in a 2d array code example
Example 1: print column in 2d numpy array
import numpy as np
x=np.arange(25).reshape(5,5)
print(x)
#print(x[:,index_of_column_you_need])
print(x[:,3])
Example 2: how to address a column in a 2d array python
>>> import numpy as np
>>> A = np.array([[1,2,3,4],[5,6,7,8]])
>>> A
array([[1, 2, 3, 4],
[5, 6, 7, 8]])
>>> A[:,2] # returns the third columm
array([3, 7])