Matplotlib for data visualization in Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Matplotlib used for in data science?

Matplotlib is a tool to create pictures from data. It helps us see patterns and understand numbers by drawing charts and graphs.

beginner

How do you create a simple line chart using Matplotlib?

You use the plot() function to draw lines. For example, plt.plot([1, 2, 3], [4, 5, 6]) draws a line connecting points (1,4), (2,5), and (3,6).

beginner

What does plt.show() do in Matplotlib?

It opens a window to display the chart you made. Without plt.show(), the picture might not appear.

beginner

How can you add a title and labels to your Matplotlib chart?

Use plt.title('Title') for the chart title, plt.xlabel('X label') for the x-axis, and plt.ylabel('Y label') for the y-axis.

beginner

What is the difference between plt.plot() and plt.bar()?

plt.plot() draws lines connecting points, good for trends. plt.bar() draws bars, good for comparing amounts.

Which Matplotlib function is used to display the final plot?

A plt.show()

B plt.draw()

C plt.plot()

D plt.display()

plt.show() opens the window to show the plot. Other functions prepare or draw but do not display.

What type of chart does plt.bar() create?

A Pie chart

B Line chart

C Scatter plot

D Bar chart

plt.bar() creates bar charts to compare values with bars.

How do you add a label to the x-axis in Matplotlib?

A plt.xaxis('label')

B plt.xlabel('label')

C plt.labelx('label')

D plt.axislabel('label')

plt.xlabel() sets the label for the x-axis.

Which command draws a line connecting points (1,2), (2,3), and (3,4)?

A plt.plot([1, 2, 3], [2, 3, 4])

B plt.bar([1, 2, 3], [2, 3, 4])

C plt.scatter([1, 2, 3], [2, 3, 4])

D plt.line([1, 2, 3], [2, 3, 4])

plt.plot() draws lines connecting the points.

What is the first step to use Matplotlib in your Python code?

A Create a plot with <code>plt.plot()</code>

B Call <code>plt.show()</code>

C Import Matplotlib with <code>import matplotlib.pyplot as plt</code>

D Save the plot with <code>plt.save()</code>

You must import Matplotlib before using its functions.

Explain how to create and display a simple line chart using Matplotlib.

Think about the steps from importing to showing the chart.

Describe how to add a title and axis labels to a Matplotlib chart and why it is important.

Labels tell us what the chart and axes mean.