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plt.subplots()のaxesをfor文1つでイテレーションする

Last updated at Posted at 2022-10-12

概要

fig, axes = plt.subplots(2,3)のaxesの要素にfor文でアクセスするとき,普段なら,

for i in range(2):
    for j in range(3):
        axes[i, j]

とするが,これを

for i in range(6):
    axes[i]

のようにfor文1つでアクセスする方法を考えた.

TL;DR

for文の前にaxes = axes.reshape(-1)を置くだけ

fig, axes = plt.subplots(2, 3)

axes = axes.reshape(-1)

for i in range(6):
    ...

axesは単なる二次元配列なので,1次元にしてやればよい.

ランダムな周波数で10個のサイングラフを生成する.

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

#サンプルデータ生成
data_size = 10
f = np.random.randint(1, 10, data_size)
t = np.arange(0, 10, 0.01)
data = [np.sin(2*np.pi*i*t) for i in f]

fig, axes = plt.subplots(5, 2)

#ここでaxesの配列を1次元にする
axes = axes.reshape(-1)

fig.tight_layout()

for i, datum in enumerate(data):
    axes[i].plot(data[i])
plt.show()

結果
output.png

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