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ヒストグラムを作る(python)

Last updated at Posted at 2022-01-01

ヒストグラムをつくるプログラム

タイトルのままです。matplotlib標準のヒストグラム(参考:[Python]Matplotlibでヒストグラムを描画する方法 )が妙に使いにくいと感じたため、作りました。

入力はリスト型のデータ系列(当たり前だがfloat型かint型)と階級幅、出力がヒストグラムの縦軸(各度数)と横軸(各階級幅の上限)。
以下、ソースコード。
データはアジア各国の平均寿命(総務統計局「世界の統計2020」より)。参考サイトは、http://www.stat.go.jp/naruhodo/4_graph/shokyu/histogram.html まで。

makeHistgram.py
def makeHistgram(data:list, classW:float)->list:
    maxValue = max(data)
    histgram = [0] * (int(maxValue / classW)+1)
    for h in data:
        h_class = int(h / classW)
        histgram[h_class] += 1
    x = [(e)*classW for e in range(len(histgram))]
    y = histgram
    return x, y

# data
data = [84, 63, 77, 65, 82, 70, 76, 69, 69, 72, 77, 71, 83, 69, 72, 75, 75, 64, 83, 75, 76, 76, 76, 70, 67, 73, 69, 76, 76, 75, 67]
# class width
classW = 5

# make histgram
x,y = makeHistgram(data, classW)
print(x,y)

# make graph
from matplotlib import pyplot as plt
plt.bar(x,y,classW-1)
plt.xticks(x, rotation=90)
plt.show()

出力結果は

result
[0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80] [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 7, 6, 12, 4]

Figure_1.png

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