How to manipulate data in Python 3 with matplotlib?

Question

I have the following data:

[0.21, 0.21, 0.33, 0.52, 0.22, 0.35, 0.43]

I would like to do the following things:

Draw a bar chart like this: The x-axis should be 0.21, 0.22, 0.33, 0.35, 0.43, 0.52.
The second things I would like to do is using a value range, for example, I would like to change the x-axis to : 0.01- 0.2, 0.2-0.4, 0.4-0.6 Instead of loop it one by one, is there any smarter way?

When you say: "the first X-axis should be 0.21, 0.22, 0.33, 0.35, 0.43, 0.52", do you mean the bins? And for the second I believe you need ax.set_xticks. — Mathieu
– Mathieu, Commented Aug 9, 2018 at 13:01

MartyFizzle · Accepted Answer · 2018-08-09 13:19:16Z

1

Part 2. of your question is simple enough to do - you just need to define the width of the bins by passing a list of the boundaries.

import matplotlib.pyplot as plt

X = [0.21, 0.21, 0.33, 0.52, 0.22, 0.35, 0.43]
plt.hist(X, bins=[0.0, 0.2, 0.4, 0.6])
plt.show()

This will create bins [0.0, 0.2), [0.2, 0.4), [0.4, 0.6] where '[' is inclusive and '(' is exclusive.

Not clear on what you require in part 1. of your question.

answered Aug 9, 2018 at 13:19

MartyFizzle

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1 Comment

The answer to part 1 is basically "plot a histogram with plt.hist".