NumPy Functions and Operations Quiz

What does the np.array() function do?

• Creates a dictionary

• Creates a list

• Creates a multidimensional array

• Creates a pandas DataFrame

Which of the following is not a method to create a NumPy array?

• np.zeros()

• np.ones()

• np.arrays()

• np.random.random()

What is the default data type of a NumPy array when not specified?

• int32

• float64

• int64

• object

Which NumPy function is used to generate evenly spaced numbers over a specified range?

• np.linspace()

• np.arange()

• np.arange_spaced()

• np.range()

What does arr.reshape(4, 3) do?

• Flattens the array

• Reshapes the array into a 4x3 matrix

• Transposes the array

• Adds dimensions to the array

Which of the following methods can be used to flatten a multidimensional NumPy array?

• np.flatten()

• arr.reshape(-1)

• np.change()

• Both B and C

What is the output shape of np.array([1, 2, 3, 4, 5, 6]).reshape(2, -1)? where -1 means numpy will automatically select number for you.

• (2, 2)

• (2, 3)

• (3, 2)

• (6, 1)

If arr is a 3x4 matrix, what will arr.reshape(12, 1) do?

• Reshape it to a single column with 12 rows

• Throw an error

• Reshape it to a single row with 12 elements

• Reshape it into a 6x2 matrix

How can you verify if reshaping is possible without modifying the number of elements?

• Compare shapes manually

• Use arr.size before and after reshaping

• Use np.check_shape()

• Reshaping always works without checking

What does arr[1:, :2] select from a 2D array arr?

• First row and first two columns

• All rows except the first, and the first two columns

• Last row and last two columns

• All rows and columns