3D scatter plots in Matplotlib - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a 3D scatter plot?

A 3D scatter plot is a graph that shows points in three dimensions (x, y, and z). It helps us see how three variables relate to each other in space.

beginner

Which matplotlib module is used to create 3D scatter plots?

The <code>mpl_toolkits.mplot3d</code> module provides 3D plotting tools, including the <code>Axes3D</code> class used to create 3D scatter plots.

beginner

How do you add a 3D scatter plot to a matplotlib figure?

First, create a 3D axes with fig.add_subplot(111, projection='3d'). Then use ax.scatter(x, y, z) to plot points in 3D.

intermediate

What parameters can you customize in a 3D scatter plot?

You can change point color, size, shape, and transparency. You can also label axes and add a title to make the plot clearer.

beginner

Why use 3D scatter plots instead of 2D scatter plots?

3D scatter plots show relationships among three variables at once, giving a fuller picture than 2D plots which show only two variables.

Which command creates a 3D axes in matplotlib?

A fig.add_subplot(111)

B plt.scatter3d()

C plt.plot3d()

D fig.add_subplot(111, projection='3d')

The correct way to create 3D axes is using fig.add_subplot(111, projection='3d'). Other options are not valid matplotlib commands.

What function plots points in a 3D scatter plot?

A ax.plot(x, y, z)

B plt.scatter(x, y)

C ax.scatter(x, y, z)

D plt.plot3d(x, y, z)

The ax.scatter(x, y, z) function plots points in 3D space on the 3D axes.

Which module must be imported to use 3D plotting in matplotlib?

A mpl_toolkits.mplot3d

B matplotlib.pyplot3d

C matplotlib3d

D mpl_3d

3D plotting tools are in the mpl_toolkits.mplot3d module.

What does the 'projection' parameter specify when adding a subplot?

A The type of plot, e.g., '3d' for 3D plots

B The color of the plot

C The size of the figure

D The data source

The 'projection' parameter tells matplotlib to create a 3D plot when set to '3d'.

Which of these can you NOT customize in a 3D scatter plot?

A Point color

B Background music

C Axis labels

D Point shape

Background music is not related to plotting and cannot be customized in matplotlib plots.

Explain how to create a basic 3D scatter plot using matplotlib.

Think about the steps from importing to displaying the plot.

Describe why 3D scatter plots are useful and when you might use them.

Consider the advantage of adding a third dimension to data visualization.