numpy add to array code example

Example 1: np.array to list

>>> a = np.array([1, 2])
>>> list(a)
[1, 2]
>>> a.tolist()
[1, 2]

Example 2: numpy append number to array

import numpy as np
a = np.array([1, 2, 3])
newArray = np.append(a, [10, 11, 12])

Example 3: append value to numpy array

x = np.random.randint(2, size=10)
x = np.append(x, 2)

Example 4: add a new column to numpy array

import numpy as np
N = 10
a = np.random.rand(N,N)
b = np.zeros((N,N+1))
b[:,:-1] = a

Example 5: how to add numpy arrays

added = a+b #elementwise
added_in_the_end = np.concatenate(a,b) #add at the end of the array
#if you want to add in multiple dimentions check the documentation of np.concatenate

Example 6: add item to numpy array python

>>> np.append([1, 2, 3], [[4, 5, 6], [7, 8, 9]])
array([1, 2, 3, ..., 7, 8, 9])