NumPy & Matplotlib Basics

What does the following code output? import numpy as np a = np.array([[1, 2], [3, 4]]) print(a.shape)

• (2,)

• (2, 2)

• (4,)

• 2x2

Which NumPy function creates an array of all zeros?

• np.zeros()

• np.empty()

• np.ones()

• np.fill()

What is the result of np.arange(1, 6, 2)?

• [1, 2, 3, 4, 5]

• [1, 3, 5]

• [2, 4, 6]

• [1, 2, 4]

Which function in NumPy is used for matrix multiplication (dot product)?

• *

• np.multiply()

• np.dot()

• np.append()

What does matplotlib.pyplot.plot() do by default?

• Plots a bar chart

• Plots an image

• Plots a line chart

• Plots a 3D surface

What does this code do? import matplotlib.pyplot as plt plt.plot([1, 2, 3], [4, 5, 6]) plt.show()

• Displays a horizontal bar chart

• Displays a 3D plot

• Displays a simple line graph

• Displays an error

What is the use of plt.subplot(2, 1, 1) in Matplotlib?

• Create a 2-row, 1-column grid and activate the 1st subplot

• Create a 1-row, 2-column grid

• Create two separate figures

• Plot two graphs in one window with transparency

Which of the following statements is true about np.linspace(0, 1, 5)?

• Creates 5 evenly spaced values from 0 to 1

• Creates values from 1 to 5

• Creates a random array

• Creates 5 integers between 0 and 1

What does np.random.randn(2, 3) do?

• Creates an array of random integers

• Creates an array of random floats from uniform distribution

• Creates a 2×3 array from standard normal distribution

• Throws an error

How can you save a plot as an image using Matplotlib?

• plt.save("plot.jpg")

• plt.savefig("plot.jpg")

• plt.output("plot.jpg")

• plt.image("plot.jpg")