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matplotlibで散布図を描くサンプル

Last updated at Posted at 2020-12-19

#例として「男女グループ別・身長・体重別・読書量」の散布図を描きます。
scatter は、特定の集団の、グループ別、XY別の大きさグラフを描くイメージです。
,
#ソース

import matplotlib.pyplot as plt
import pandas as pd

#サンプルデータ
dt={"x身長"       :[ 170,170,150,150,140,140,165,165,155,155] ,
      "y体重"     :[  55, 51, 60, 66, 80, 65, 77, 67, 58, 57] ,
      "s読書量" :[ 700, 67, 80, 30, 55, 34, 45, 10,930,929] ,
       "c性別"    :[   1,  2,  1,  2,  1,  2,  1,  2,  1,  2] 
    }
df=pd.DataFrame(dt)

#描画
fig, ax = plt.subplots()
scatter = ax.scatter(df['x身長'], df['y体重'], c=df['c性別'], s=df['s読書量'], alpha=0.5 )

#タイトル等 
ax.set_xlabel("x身長" , fontsize=15, fontname="MS Gothic")
ax.set_ylabel("y体重" , fontsize=15, fontname="MS Gothic")
ax.set_title('身長 体重 性別別 読書量の分布' , fontname="MS Gothic")

#男女ラベル
legend1=ax.legend(scatter.legend_elements()[0], ["",""]   ,  loc="lower left", prop={"family":"MS Gothic"}   ) 
legend1.set_title("c性別"   ,  prop={"family":"MS Gothic"} )
ax.add_artist(legend1)

#読書量ラベル
handles, labels = scatter.legend_elements(prop="sizes",  num=3 , alpha=0.6)
legend2 = ax.legend(handles, labels, loc="upper right",  prop={"family":"MS Gothic"} )
legend2.set_title("s読書量"   ,  prop={"family":"MS Gothic"} )

ax.grid(True)
fig.tight_layout()
 
plt.show()

#結果
image.png

#参考
Scatter Demo2
Scatter plot
Scatter plots with a legend
matplotlib.pyplot.scatter
Matplotlibで簡単に日本語を表示する方法(Windows)
凡例の中に日本語タイトルを表示する【matplotlib】

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