如何使用刻面创建条形图并使用Seaborn添加标签

Question

I have the following dataframe

import pandas as pd    
df = pd.DataFrame({'reg' : ['A', 'B', 'C'],
                   'file': ['1', '1', '2'],
                   'val' : [1, 2, 3]})

I would like to create a barplot using seaborn , with faceting by file , color by reg and also add the val on top of each bar

I have tried this

  import seaborn as sns
  g = sns.FacetGrid(df, col='file', hue='reg', col_wrap=2)
  g.map(sns.barplot, 'reg', 'val').add_legend()
  g.savefig('test_so.png')

But, this doesn't do the coloring right

Any ideas?

Answer 1

You need order parameter, add unique per @jdehesa mentions below:

g = sns.FacetGrid(df, col='file', hue='reg', col_wrap=2)
g.map(sns.barplot, 'reg', 'val', order=df.reg.unique()).add_legend()

Output:

---

Add labels to bars in facetgrid plot

g = sns.FacetGrid(df, col='file', hue='reg', col_wrap=2)
g.map(sns.barplot, 'reg', 'val', order=df.reg.unique()).add_legend()

for ax in g.axes:
    for p in ax.patches:
             ax.annotate("%.2f" % p.get_height(), (p.get_x() + p.get_width() / 2., p.get_height()),
                 ha='center', va='center', fontsize=11, color='black', xytext=(0, 5),
                 textcoords='offset points')

Output: