Markers on data points in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of markers in a matplotlib plot?

Markers help highlight individual data points on a plot, making it easier to see exact values and patterns.

beginner

How do you add markers to a line plot in matplotlib?

Use the 'marker' parameter in the plot() function, for example: plt.plot(x, y, marker='o') adds circle markers.

beginner

Name three common marker styles in matplotlib.

Common markers include 'o' (circle), 's' (square), and '^' (triangle up).

intermediate

How can you change the size and color of markers in matplotlib?

Use 'markersize' or 'ms' to change size and 'markerfacecolor' or 'mfc' to change color, e.g., plt.plot(x, y, marker='o', ms=10, mfc='red').

beginner

What happens if you set marker='None' in a matplotlib plot?

No markers will be shown on the data points; only the line or plot elements will appear.

Which parameter adds markers to data points in matplotlib's plot()?

A linestyle

B color

C marker

D linewidth

The 'marker' parameter specifies the shape of markers on data points.

What marker symbol creates square markers in matplotlib?

A s

B ^

C o

D *

's' stands for square markers.

How do you increase the size of markers in a plot?

A Use 'linestyle'

B Use 'markersize' or 'ms'

C Use 'color'

D Use 'linewidth'

'markersize' or 'ms' controls the size of markers.

If you want no markers on your plot, what should you set 'marker' to?

A x

B o

C s

D None

Setting marker=None removes markers from the plot.

Which of these is NOT a valid marker style in matplotlib?

A z

B o

C s

D ^

'z' is not a valid marker style.

Explain how to add and customize markers on data points in a matplotlib plot.

Think about the parameters inside plt.plot() that control markers.

Describe the visual difference between a plot with markers and one without markers.

Consider how markers help you see each point clearly.