Review Ch 2

numbers=list(range(1,40))

print(len(numbers))

• 39

• 40

• 41

• 42

test = list(range(1,10))

print(10 in test)

• True

• 10

• 9

• False

x = np.array([5,0,3,3,7,9])

print(x.ndim)

• 1

• 6

x = [5, 0, 3, 3, 7, 9, 3, 5, 2, 4]

print(x1[:5])

• [7 3 3 0 5]

• [5 0 3 3 7]

• [3 3 7 5 0]

x = [5, 0, 3, 3, 7, 9, 3, 5, 2, 4]

y = x1[::2]

print(y[5])

• error

• 5

• 4

x = np.array([[5, 0, 3, 3], [7, 9, 3, 5], [2, 4, 7, 6]])

print(x[:2, :3])

• [[5 0 3] [7 9 3]]

• [[7 9 3] [5 0 3]]

• [7 9 3]

• [5 0 3]

x = np.array([[5, 9, 8, 9], [4, 3, 0, 3]])

y = x

y[2,0]=3

print(x)

• [[5, 9, 8, 9], [4, 3, 0, 3]]

• [[5, 9, 8, 9], [3, 3, 0, 3]]

• [[3, 9, 8, 9], [4, 3, 0, 3]]

x = np.array([[5, 9, 8, 9], [4, 3, 0, 3]])

y = x.copy()

y[2,0]=3

print(x)

• [[5, 9, 8, 9], [4, 3, 0, 3]]

• [[5, 9, 8, 9], [3, 3, 0, 3]]

• [[3, 9, 8, 9], [4, 3, 0, 3]]

x = np.array[5,0,3,3,7,9,3,5,2,4]

print(x1.reshape(5,2))

• [[5 0] [3 3] [7 9] [3 5] [2 4]]

• [[5 0 3 3 7] [9 3 5 2 4]]

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

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

z = np.array([9,9,9])

print(np.concatenate((x,y,z)))

• [1 2 3 3 2 1 9 9 9]

• [[1 2 3] [3 2 1] [9 9 9]]