如何根据多列的值更改标记大小

Question

我需要做一个散点图，其中每个点的大小由

xy

的数量决定。

样本

data

来自学生表现数据集：

student-mat.csv

import pandas as pd
import seaborn as sns

data =\
{'traveltime': [2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 3, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 1, 1, 4, 1, 3, 2, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 2, 1, 1, 1, 1, 3, 3, 1, 2, 2, 2, 1, 4, 2, 1, 1, 1, 1, 3, 2, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 3, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 1, 4, 2, 1, 2, 1, 1, 2, 2, 1, 1, 3, 1, 2, 2, 1, 1, 2, 3, 2, 1, 1, 1, 2, 3, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 2, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 4, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 1, 3, 2, 1, 2, 2, 2, 2, 3, 2, 2, 1, 2, 2, 2, 3, 2, 3, 2, 3, 1, 1, 2, 4, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 1, 1, 2, 1, 2, 1, 3, 1],
'G2': [6, 5, 8, 14, 10, 15, 12, 5, 18, 15, 8, 12, 14, 10, 16, 14, 14, 10, 5, 10, 14, 15, 15, 13, 9, 9, 12, 16, 11, 12, 11, 16, 16, 10, 14, 7, 16, 16, 12, 13, 10, 12, 18, 8, 10, 8, 12, 19, 15, 7, 13, 13, 11, 10, 13, 9, 15, 15, 10, 16, 11, 8, 10, 9, 10, 15, 13, 7, 9, 16, 15, 10, 6, 12, 12, 9, 11, 11, 8, 5, 12, 10, 6, 15, 10, 9, 7, 14, 10, 6, 7, 17, 6, 10, 13, 10, 15, 9, 14, 9, 7, 17, 13, 6, 18, 11, 8, 18, 13, 15, 19, 10, 13, 19, 9, 15, 13, 14, 7, 13, 15, 14, 13, 11, 7, 13, 10, 8, 4, 18, 0, 0, 13, 11, 0, 0, 0, 0, 12, 16, 9, 9, 11, 14, 0, 11, 7, 11, 6, 9, 5, 13, 10, 0, 11, 8, 12, 8, 15, 12, 6, 9, 0, 10, 8, 11, 10, 15, 7, 14, 5, 15, 11, 7, 11, 9, 13, 5, 8, 10, 8, 13, 17, 9, 13, 12, 12, 15, 7, 9, 12, 8, 8, 9, 14, 15, 15, 9, 18, 9, 16, 10, 9, 6, 10, 9, 7, 12, 9, 7, 8, 12, 13, 7, 10, 15, 6, 6, 7, 10, 6, 5, 16, 13, 13, 8, 15, 11, 8, 10, 13, 11, 9, 13, 7, 9, 13, 12, 11, 7, 12, 11, 0, 12, 0, 18, 12, 8, 5, 15, 8, 10, 9, 9, 12, 9, 12, 11, 14, 9, 18, 8, 12, 9, 10, 17, 9, 10, 9, 0, 9, 14, 11, 14, 10, 12, 9, 9, 8, 11, 8, 9, 12, 9, 9, 10, 18, 12, 14, 13, 11, 15, 12, 18, 13, 12, 9, 8, 13, 15, 10, 11, 12, 17, 14, 12, 18, 9, 12, 10, 9, 12, 11, 10, 13, 11, 8, 10, 11, 11, 13, 9, 11, 14, 15, 12, 15, 10, 9, 14, 8, 14, 0, 8, 9, 15, 13, 8, 15, 10, 12, 10, 15, 8, 10, 13, 15, 10, 15, 13, 7, 13, 7, 8, 11, 9, 13, 12, 10, 16, 13, 12, 11, 15, 11, 10, 13, 6, 10, 12, 7, 12, 11, 5, 18, 8, 14, 9, 15, 10, 14, 6, 11, 5, 5, 9, 5, 5, 9, 5, 9, 16, 8, 12, 9]}

df = pd.DataFrame(data=data)

sns.scatterplot(data=df, x="traveltime", y="G2", s=100)

此代码更改所有点的大小。

我试过

size=xy

，结果是

NameError: name 'xy' is not defined

Answer 1

当您提供

data=df

时，不能使用

size=xy

，因为它需要是单个列名或数字映射。提供像

size=df.traveltime * df.G2

.

这样的数字映射

hue

被添加到绘图中，因此颜色会随着大小的变化而变化。

import seaborn as sns

# create the metric for setting the marker size
xy = df.traveltime.mul(df.G2)

# create the plot with 
ax = sns.scatterplot(data=df, x="traveltime", y="G2", size=xy, hue=xy)

# move the legend for better cosmetics
sns.move_legend(ax, bbox_to_anchor=(1, 0.5), loc='center left', frameon=False)