
import numpy as np
from numpy import random

#create empty array
a =  np.empty([3])
print(a)

[4.64136008e-310 0.00000000e+000 1.58101007e-322]


#create array with ones
a = np.ones([2,3])
print(a)

[[1. 1. 1.]
 [1. 1. 1.]]


#create array with zeros
a = np.zeros([3,5])
print(a)

[[0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0.]]


#random integer from 0 to 5
random.randint(5)

4


#array with random int from 0 to 5 and dim (3,5)
random.randint(5, size=(3, 5))

array([[2, 1, 1, 0, 3],
       [4, 0, 4, 1, 2],
       [0, 3, 3, 2, 3]])


#random float from 0 to 1
random.rand()

0.19057158890417292


#array with random float between 0 and 1 and dim (3,5)
random.rand(3, 5)

array([[0.77054253, 0.18653799, 0.67338338, 0.64234377, 0.34576529],
       [0.75605162, 0.13783815, 0.53607811, 0.06650575, 0.36245488],
       [0.80276601, 0.13417592, 0.38245341, 0.3449446 , 0.0088425 ]])


#random number from array
random.choice([3, 5, 7, 9])

3


#array with random choice from array nd dim (3,5)
random.choice([3, 5, 7, 9], size=(3, 5))

array([[3, 9, 7, 7, 3],
       [3, 7, 3, 3, 7],
       [3, 5, 3, 7, 5]])

Generate arrays with random or predefined numbers¶