how can I change a two dimensional array to one dimensional

Question

I am trying to change a two dimensional array to one dimensional, my code is like this:

x = np.array([[1, 2, 4], [3, 4], [1,2,3,4,5,6,7]])
x = x.flatten()

however, I found that flatten function works well on

x = np.array([[1, 2], [3, 4]])

but it does not work on

x = np.array([[1, 2, 4], [3, 4], [1,2,3,4,5,6,7]])

could anyone help me to change

np.array([[1, 2, 4], [3, 4], [1,2,3,4,5,6,7]])

to

np.array([[1, 2, 4, 3, 4, 1,2,3,4,5,6,7])

thank you

user_5916727 · Answer

You can try using concatenate (numpy documentation):

flatten_x = np.concatenate(x)

user_1543648 · Answer

t = [[4, 9, 2], [3, 5, 7], [8, 1, 5]]
arr_t=[]
for a in t:
    arr_t+=a

user_10113213 · Answer

Use the following simple code.

import numpy as np

x = np.array([[1, 2, 4], [3, 4], [1,2,3,4,5,6,7]])
y = sum(x.tolist(),[])
print(np.array(y))