如何将char设置为x轴上的标签？ matplotlib

Question

I have a set of characters eg ['a','a','b','b'] . When I plot them this way:

import matplotlib.pyplot as plt 

x_labels = ['a','a','b','b']
y = [0,1,2,3]

plt.plot(x_labels,y)
plt.show()

This is what I get:

However, I would like to have on x-axis: a,a,b,b , not just a,b .

How can I accomplish this?

Answer 1

The following should work for you:

import matplotlib.pyplot as plt 
import numpy as np

x_labels = ['a','a','b','b']

# Create dummy x values, with a value for every label entry
x = np.r_[:len(x_labels)]
y = [0,1,2,3]

plt.scatter(x, y, color='r', marker='x')

# Change the xticks as desired
plt.xticks(x, x_labels)
plt.show()

This trick is to set the x-values as placeholder integers and then change their label to whatever you desire.

This gave me the following plot, which I think is what you desired:

Answer 2

You can use dummy integers to set the position of the points and label the respective ticks according to your x_labels array

import matplotlib.pyplot as plt 

x_labels = ['a','a','b','b']
y = [0,1,2,3]

plt.plot(range(len(x_labels)),y)
plt.xticks(range(len(x_labels)), x_labels)
plt.show()