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Review Questions

Short Answer

1. Create the following NumPy arrays

a) A 1-D array called z having 10 elements and all the elements are set to zero.

Show the answer.

>>> import numpy as np
>>> z = np.zeros(10)

b) A 1-D array called vowels having the elements ‘a’, ‘e’, ‘i’, ‘o’ and ‘u’.

Show the answer.

>>> vowels = np.array(['a','e','i','o','u'])

c) A 2-D array called n having 2 rows and 5 columns and all the elements are set to 1 and dtype as int.

Show the answer.

>>> n = np.ones((2,5), dtype=np.int64)

d) Use nested Python lists to create a 2-D array called myarray1 having 3 rows and 3 columns and store the following data:
2.7, -2, -19
0, 3.4, 99.9
10.6, 0, 13

Show the answer.

>>> myarray1 = np.array([[2.7, -2, -19],[0, 3.4, 99.9],[10.6, 0, 13]])

e) A 2-D array called myarray2 using arange() having 3 rows and 5 columns with start value = 4, step size 4 and dtype as float.

Show the answer.

>>> myarray2 = np.arange(4,61,4,float).reshape(3,5)

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