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seaborn散布図の各点にラベルを付ける

Last updated at Posted at 2020-04-25

初投稿の42歳おじさん。
seabornに乗り換えたて。

###困ったこと
散布図を書いて、idと各点の対応がわからなくてイマイチだった。
調べてみると、各点へのラベル付けもやり方があるらしいので、備忘録を残す。

###実装方法

### -*- coding utf-8 -*-
import pandas as pd
import numpy as np
import seaborn as sns
import matplotlib.pyplot as plt

###
def label_point(x,y,id,ax):
  df_tmp=pd.concat({'x':x,'y':y,'id':id}, axis='columns')
  for i, point in df_tmp.iterrows():
    ax.text(point['x'], point['y'], point['id'],\
    fontsize=5\
    )

###
if __name__=='__main__':
  rfilename='testdata.csv'
  data=pd.read_csv(rfilename)

  # 散布図描画
  ax=sns.scatterplot(x=data.iloc[:,3], y=data.iloc[:,4], hue=data.iloc[:,5])

  # ラベル付け
  label_point(data.iloc[:,3],data.iloc[:,4],data.iloc[:,0],ax)

  # 保存
  wfilename='testdraw.png'
  plt.savefig(wfilename)

###データの一部
旅行作文の言語特徴を2次元に落としたものだが、詳しくは割愛する。

id sex age 1-dim 2-dim lab
1 1 63 147.05500793457 -81.8567810058594 me
2 2 45 -128.938018798828 88.1118698120117 fy
3 1 66 20.0744075775146 113.524360656738 me
4 1 68 -64.7453689575195 49.7739143371582 me
5 2 49 -26.7232112884521 -164.791641235352 fy

描画結果

idが浮動小数点になっているが、本題ではないのでこのままで。
testdraw.png

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