# Cell 1
import numpy as np

# Cell 2
a = np.array([1, 2, 3])

# Cell 3
b = np.array([[1, 2], [3, 4]])

# Cell 4
np.zeros((2, 3))

# Cell 5
np.ones((3, 3))

# Cell 6
np.eye(4)  # Identity matrix

# Cell 7
np.arange(10, 50, 5)

# Cell 8
np.linspace(0, 1, 5)

# Cell 9
np.full((2, 2), 7)

# Cell 10
np.random.rand(3, 3)

# Cell 11
arr = np.arange(10)
arr

# Cell 12
arr[3:7]

# Cell 13
arr[::-1]

# Cell 14
arr[::2]

# Cell 15
b = np.array([[1, 2, 3], [4, 5, 6]])
b[:, 1]