Efficient way for appending numpy array

Question

I will keep it simple.I have a loop that appends new row to a numpy array...what is the efficient way to do this.

n=np.zeros([1,2])
for x in [[2,3],[4,5],[7,         


        

Answer 1

You might want to try:

import numpy as np

n = np.reshape([], (0, 2))
for x in [[2,3],[4,5],[7,6]]:
      n = np.append(n, [x], axis=0)

Instead of np.append you can also use n = np.vstack([n,x]). I also agree with @Bi Rico that I also would use a list, if n does not need to accessed within the loop.