3D scatterのRuntimeWarningエラー

RuntimeWarning: invalid value encountered in sqrt

問題コード

plt.subplot(111, projection='3d')
plt.scatter(X, Y, Z)

出力

RuntimeWarning: invalid value encountered in sqrt
  scale = np.sqrt(self._sizes) * dpi / 72.0 * self._factor

解決策

解決コード

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.scatter(X, Y, Z)

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全体コード

import matplotlib.pyplot as plt
from sklearn.datasets import make_swiss_roll
X, t = make_swiss_roll(n_samples=1000)

# RuntimeWarningエラー
plt.subplot(111, projection='3d')
plt.scatter(X[:,0], X[:,1], X[:,2], c=t)
plt.show()

# 成功
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.scatter(X[:,0], X[:,1], X[:,2], c=t)
plt.show()