Plot multiple boxplot in one graph in pandas or matplotlib?

Question

I have a two boxplotes

a1=a[['kCH4_sync','week_days']]
a1.boxplot(by = 'week_days', meanline=True, showmeans=True, showcaps=True, showbox=True,            
                 showfliers=False)
a2=a[['CH4_sync','week_days']]
a2.boxplot(by = 'week_days', meanline=True, showmeans=True, showcaps=True, showbox=True,     
                 showfliers=False)

But I want to place them in one graph to compare them. Have you any advice to solve this problem? Thanks!

Answer 1

To plot multiple boxplots on one matplotlib graph you can pass a list of data arrays to boxplot, as in:

import numpy as np
import matplotlib.pyplot as plt

x1 = 10*np.random.random(100)
x2 = 10*np.random.exponential(0.5, 100)
x3 = 10*np.random.normal(0, 0.4, 100)
plt.boxplot ([x1, x2, x3])

The only thing I am not sure of is if you want each boxplot to have a different color etc. Generally it won't plot in different colour