Basic plt.plot usage in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does plt.plot(x, y) do in matplotlib?

It creates a line plot by connecting points defined by the lists or arrays x and y on the x-axis and y-axis respectively.

beginner

How do you add labels to the x-axis and y-axis in matplotlib?

Use plt.xlabel('label') for the x-axis and plt.ylabel('label') for the y-axis to add descriptive labels.

beginner

What is the purpose of plt.show()?

It displays the plot window with all the current figures and plots. Without it, the plot might not appear in some environments.

beginner

How can you change the line style and color in plt.plot()?

You can add a format string like 'r--' where 'r' is red color and '--' is dashed line. For example, plt.plot(x, y, 'r--').

beginner

What happens if you call plt.plot() multiple times before plt.show()?

All plots are drawn on the same figure, allowing you to overlay multiple lines or data sets in one graph.

What does plt.plot([1, 2, 3], [4, 5, 6]) do?

A Creates a bar chart

B Plots points (4,1), (5,2), (6,3)

C Plots points (1,4), (2,5), (3,6) connected by lines

D Creates a scatter plot without lines

The first list is x values and the second is y values, connected by lines.

Which command adds a title to a matplotlib plot?

A plt.title('My Plot')

B plt.label('My Plot')

C plt.name('My Plot')

D plt.header('My Plot')

Use plt.title() to add a title to the plot.

How do you display the plot after creating it?

A plt.render()

B plt.display()

C plt.draw()

D plt.show()

plt.show() opens the window with the plot.

What does the format string 'g-.' mean in plt.plot(x, y, 'g-.')?

A Green dash-dot line

B Gray solid line

C Green dotted line

D Gold dashed line

'g' is green color, '-.' is dash-dot line style.

If you want to plot two lines on the same graph, what should you do?

A Call plt.show() twice

B Call plt.plot() twice before plt.show()

C Use plt.plot() only once with combined data

D Create two separate figures

Multiple plt.plot() calls add lines to the same figure.

Explain how to create a simple line plot with labels for x and y axes using matplotlib.

Think about the steps to draw and display a plot with axis descriptions.

Describe how to customize the color and line style of a plot line in matplotlib.

Remember the short string codes like 'r--' for red dashed lines.