In order to build a basic radar chart, we can use the basic functions of matplotlib. Here is an example of a simple one, displaying the values of 5 variables for only one individual. The input data is a pandas data frame where each line represents an individual, and each column a variable. See graph #391 and #392 to see how to represent several individuals.

# Libraries
import matplotlib.pyplot as plt
import pandas as pd
from math import pi
# Set data
df = pd.DataFrame({
'group': ['A','B','C','D'],
'var1': [38, 1.5, 30, 4],
'var2': [29, 10, 9, 34],
'var3': [8, 39, 23, 24],
'var4': [7, 31, 33, 14],
'var5': [28, 15, 32, 14]
# number of variable
N = len(categories)
# We are going to plot the first line of the data frame.
# But we need to repeat the first value to close the circular graph:
values += values[:1]
# What will be the angle of each axis in the plot? (we divide the plot / number of variable)
angles = [n / float(N) * 2 * pi for n in range(N)]
angles += angles[:1]
# Initialise the spider plot
ax = plt.subplot(111, polar=True)
# Draw one axe per variable + add labels
plt.xticks(angles[:-1], categories, color='grey', size=8)
# Draw ylabels
plt.yticks([10,20,30], ["10","20","30"], color="grey", size=7)
# Plot data
ax.plot(angles, values, linewidth=1, linestyle='solid')
# Fill area
ax.fill(angles, values, 'b', alpha=0.1)

# Show the graph

Contact & Edit

👋 This document is a work by Yan Holtz. You can contribute on github, send me a feedback on twitter or subscribe to the newsletter to know when new examples are published! 🔥

This page is just a jupyter notebook, you can edit it here. Please help me making this website better 🙏!