I have a list of arrays of different dimension and i want to concatenate those arrays into one single array.
suppose i have
LIST = [array([[0.786, 0.819]]), array([[0.811, 0.804]]), array([[0.821]])]
and i want to convert it in an array:
ARRAY = array([0.786, 0.819, 0.811, 0.804, 0.821])
so I would like to concatenate all the values of each arrays of my list in a single array
you can use numpy.hstack and no need for looping
import numpy as np
LIST = [np.array([[0.786, 0.819]]), np.array([[0.811, 0.804]]), np.array([[0.821]])]
arr = np.hstack([*LIST])
arr
array([[0.786, 0.819, 0.811, 0.804, 0.821]])
l = [np.array([[0.786, 0.819]]), np.array([[0.811, 0.804]]), np.array([[0.821]])]
a = np.array([])
for x in l:
a = np.concatenate((a, x[0]))
print (a)
Outuput
[0.786 0.819 0.811 0.804 0.821]
np.hstack([i[0] for i in LIST])
It could be np.hstack(LIST), if your arrays were vectors and not matrices, i.e. using only a single [], instead of [[]].
