如何在Altair中创建分组条形图？ [英] How to create a grouped bar chart in Altair?

问题描述

如何在Altair中创建分组条形图？我正在尝试以下操作，但它只是并排生成两个图形。

How does one create a grouped bar chart in Altair? I'm trying the following but it is just producing two graphs side by side.

Chart(data).mark_bar().encode(
   column='Gender',
   x='Genre',
   y='Rating',
   color='Gender'
)

推荐答案

组条形图示例

我显示了分组条形图。您还可以在此处中查看完整文档。

I show a simplified example of Grouped Bar Chart from Altair's documentation. You can also see the full documentation here.

基本上，您必须将x轴性别（每个子图中的F或M）指定为y轴，并将其指定为 Rating 和类型作为列。

Basically, you have to specify x-axis Gender (F or M in each subplot), y-axis as Rating and Genre as Column.

from altair import *
import pandas as pd

# create dataframe
df = pd.DataFrame([['Action', 5, 'F'], 
                   ['Crime', 10, 'F'], 
                   ['Action', 3, 'M'], 
                   ['Crime', 9, 'M']], 
                  columns=['Genre', 'Rating', 'Gender'])

chart = Chart(df).mark_bar().encode(
   column=Column('Genre'),
   x=X('Gender'),
   y=Y('Rating'),
   color=Color('Gender', scale=Scale(range=['#EA98D2', '#659CCA']))
).configure_facet_cell(
    strokeWidth=0.0,
)

chart.display() # will show the plot

条形图看起来像l追随者

The bar chart will look like following

添加Axis参数

您只需要遵循 Axis 文档中的参数以使绘图看起来更漂亮：

You only have to follow Axis parameters in documentation to make the plot looks prettier:

chart = Chart(df).mark_bar().encode(
   column=Column('Genre', 
                 axis=Axis(axisWidth=1.0, offset=-8.0, orient='bottom'),
                 scale=Scale(padding=4.0)),
   x=X('Gender', axis=False),
   y=Y('Rating', axis=Axis(grid=False)),
   color=Color('Gender', scale=Scale(range=['#EA98D2', '#659CCA']))
).configure_facet_cell(
    strokeWidth=0.0,
)

chart.display()

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