Quiz 9

import numpy as np

arr = np.array([1, 2, 3, 4, 5])

print(arr)

• [1 2 3 4 5]

• (1 2 3 4 5)

• 1 2 3 4 5

• {1 2 3 4 5}

import numpy as np

arr = np.array([1, 2, 3, 4, 5])

print(arr)

print(type(arr))

• array

• list

• tuple

• all choices is wrong

import numpy as np

d = np.array([[[1, 2, 3], [4, 5, 6]], [[1, 2, 3], [4, 5, 6]]])

print(d.ndim)

• 0

• 4 X 3

• 3

• 4

import numpy as np

arr = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])

print(arr[-1, 0, -2])

• 2

• 5

• 8

• 11

import numpy as np

arr = np.array([[1,2,3,4,5], [6,7,8,9,10]])

print(arr[-2, -5] * arr[0, 0] *arr[1, 1])

• 5

• 7

• 30

• error

import numpy as np

arr = np.array([1, 2, 3, 4, 5, 6, 7])

print(arr[3:5])

• [3 4 5]

• [3:5]

• all choices is wrong

• [4 5]

import numpy as np

arr = np.array([[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]])

print(arr[0:1, 1:-2])

• []

• [[2 3]]

• [[2 3],[7 8]]

• all choices is wrong

import numpy as np

arr = np.array([1, 2, 3, 4], dtype='i4')

print(arr)

print(arr.dtype)

• [1 2 3 4]

  int32

• [1 2 3 4]

  int

• [1 2 3 4]

  i4

• [[1 2 3 4]]

  i4

import numpy as np

arr = np.array([1.1, 2.1, 3.1])

newarr = arr.astype('S')

print(newarr)

print(newarr.dtype)

• [1.1' 2.1' 3.1']

  |S32

• [b'1.1' b'2.1' b'3.1']

  |float64

• [b'1.1' b'2.1' b'3.1'] |S32

• [1.1' 2.1' 3.1']

  |float64

import numpy as np

arr = np.array([-1,1,0,-3,3,0])

newarr = arr.astype(bool)

print(newarr) print(newarr.dtype)

• [ True True False True True False]

  bool

• ERROR

• [ False True False False True False]

  bool

• all choices is wrong