bug

[holtzy]

Hi Yan,

in the Graph Gallery in some example in Python there are mistakes
for example in the "Show Number of Observations"

import matplotlib.pyplot as plt
import numpy as np
import seaborn as sns
import pandas as pd

Dataset:

a = pd.DataFrame({ 'group' : np.repeat('A',500), 'value': np.random.normal(10, 5, 500) })
b = pd.DataFrame({ 'group' : np.repeat('B',500), 'value': np.random.normal(13, 1.2, 500) })
c = pd.DataFrame({ 'group' : np.repeat('B',500), 'value': np.random.normal(18, 1.2, 500) })
d = pd.DataFrame({ 'group' : np.repeat('C',20), 'value': np.random.normal(25, 4, 20) })
e = pd.DataFrame({ 'group' : np.repeat('D',100), 'value': np.random.uniform(12, size=100) })
df = pd.concat([a,b,c,d,e])

Start with a basic boxplot

sns.boxplot(x="group", y="value", data=df) # the assignment ax is missing

Calculate number of obs per group & median to position labels

medians = df.groupby(['group'])['value'].median().values
nobs = df.groupby("group").size().values
nobs = [str(x) for x in nobs.tolist()]
nobs = ["n: " + i for i in nobs]

Add it to the plot

pos = range(len(nobs))
for tick,label in zip(pos,ax.get_xticklabels()):
plt.text(pos[tick], medians[tick] + 0.4, nobs[tick], horizontalalignment='center', size='medium', color='w', weight='semibold')

add title

plt.title("Boxplot with number of observation", loc="left")

show the graph

plt.show()

================

Best regards

--Marco