Colorbar positioning in Matplotlib - Step-by-Step Execution

Concept Flow - Colorbar positioning

Create plot with data

↓

Add colorbar

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Choose position: 'right', 'left', 'top', 'bottom'

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Set colorbar location parameter

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Render plot with colorbar in chosen position

This flow shows how to add a colorbar to a plot and position it on any side by setting the location parameter.

Execution Sample

Matplotlib

import matplotlib.pyplot as plt
import numpy as np

img = np.random.rand(5,5)
plt.imshow(img)
plt.colorbar(location='bottom')
plt.show()

This code creates a heatmap and adds a colorbar positioned at the bottom of the plot.

Execution Table

Step	Action	Parameter/Value	Effect on Plot
1	Generate random 5x5 data	img = random 5x5 array	Data ready for plotting
2	Create heatmap	plt.imshow(img)	Heatmap displayed with default color scale
3	Add colorbar	plt.colorbar(location='bottom')	Colorbar appears below the heatmap
4	Show plot	plt.show()	Plot window opens with heatmap and bottom colorbar
5	Change location	location='right'	Colorbar moves to the right side
6	Change location	location='left'	Colorbar moves to the left side
7	Change location	location='top'	Colorbar moves above the heatmap
8	Change location	location='bottom'	Colorbar moves below the heatmap

💡 All colorbar positions demonstrated; execution ends after showing plot.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
img	undefined	5x5 random array	5x5 random array	5x5 random array	5x5 random array
colorbar location	default (right)	default (right)	default (right)	'bottom'	'bottom' or changed as per step

Key Moments - 2 Insights

Why does the colorbar sometimes appear on the right even if I want it at the bottom?

The colorbar position is controlled by the 'location' parameter in plt.colorbar(). Check the execution_table rows 3 and 4 where location='bottom' places it below, but default is 'right'.

Can I place the colorbar on the top of the plot?

Yes, by setting location='top' in plt.colorbar(). See execution_table row 7 where this moves the colorbar above the heatmap.

Visual Quiz - 3 Questions

Look at the execution_table, at which step is the colorbar first positioned at the bottom?

A Step 3

B Step 5

C Step 7

D Step 2

💡 Hint

Check the 'Parameter/Value' column for location='bottom' in the execution_table.

According to variable_tracker, what is the value of 'colorbar location' after Step 3?

A 'right'

B 'bottom'

C 'top'

D 'left'

💡 Hint

Look at the 'colorbar location' row under 'After Step 3' in variable_tracker.

If you want the colorbar on the left side, which location value should you use according to the execution_table?

A 'top'

B 'right'

C 'left'

D 'bottom'

💡 Hint

See execution_table row 6 for location values and their effects.

Concept Snapshot

plt.colorbar(location='side') adds a colorbar to a plot.
'side' can be 'right' (default), 'left', 'top', or 'bottom'.
Position controls where the colorbar appears around the plot.
Use plt.imshow() or similar to create the plot first.
Call plt.colorbar() after plotting to add the colorbar.
Call plt.show() to display the final plot.

Full Transcript

This lesson shows how to add and position a colorbar in a matplotlib plot. First, we create a heatmap using random data. Then, we add a colorbar using plt.colorbar() and specify its position with the location parameter. The colorbar can be placed on the right, left, top, or bottom of the plot. We track the variable changes and see how the plot updates step-by-step. This helps beginners understand how to control colorbar placement visually and practically.