matplotlib – clabel で等高線にラベルを付ける方法

import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D


X, Y = np.mgrid[-10:11, -10:11]
Z = X ** 2 + Y ** 2 + X * Y

fig, ax = plt.subplots(figsize=(7, 7))
cs = ax.contour(X, Y, Z)
ax.clabel(cs)

plt.show()

import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D


X, Y = np.mgrid[-10:11, -10:11]
Z = X ** 2 + Y ** 2 + X * Y

fig, ax = plt.subplots(figsize=(7, 7))
cs = ax.contour(X, Y, Z)
print(cs.levels)

# 2つおきに表示する。
ax.clabel(cs, cs.levels[::2])

plt.show()

import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D


X, Y = np.mgrid[-10:11, -10:11]
Z = X ** 2 + Y ** 2 + X * Y

fig, ax = plt.subplots(figsize=(7, 7))
cs = ax.contour(X, Y, Z)
ax.clabel(cs, colors="black")

plt.show()

import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D


X, Y = np.mgrid[-10:11, -10:11]
Z = X ** 2 + Y ** 2 + X * Y

# 各等高線の色をランダムに作成する。
np.random.seed(42)
colors = np.random.rand(len(cs.levels), 3)

fig, ax = plt.subplots(figsize=(7, 7))
cs = ax.contour(X, Y, Z)
ax.clabel(cs, colors=colors)

plt.show()

import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d import Axes3D


X, Y = np.mgrid[-10:11, -10:11]
Z = X ** 2 + Y ** 2 + X * Y

fig, [ax1, ax2] = plt.subplots(1, 2, figsize=(10, 5))

cs = ax1.contour(X, Y, Z)
ax1.set_title("inline=True")
ax1.clabel(cs, inline=True, inline_spacing=5)

cs = ax2.contour(X, Y, Z)
ax2.set_title("inline=False")
ax2.clabel(cs, inline=False)

plt.show()