[英]Matplotlib: how to set a tick label above a plot
這是我使用matplotlib繪制的正弦和余弦圖。 但是刻度線標簽位於圖的下方,幾乎看不到。
我的python代碼是:
import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure(figsize=(8,6), dpi=96)
plt.subplot(111)
X = np.linspace(-np.pi, np.pi, 256, endpoint=True)
C,S = np.cos(X), np.sin(X)
plt.plot(X, C, color="blue", linewidth=2.5, linestyle="-", label="consine")
plt.plot(X, S, color="red", linewidth=2.5, linestyle="-", label="sine")
plt.xlim(X.min()*1.1, X.max()*1.1)
plt.ylim(C.min()*1.1, C.max()*1.1)
plt.xticks([-np.pi, -np.pi/2, 0, np.pi/2, np.pi],
[r'$-\pi$', r'$-\frac{\pi}{2}$', r'$0$', r'$+\frac{\pi}{2}$', r'$+\pi$'])
plt.yticks([-1, 1],
[r'$-1$', r'$+1$'])
ax = plt.gca()
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.spines['bottom'].set_position(('data',0))
ax.yaxis.set_ticks_position('left')
ax.spines['left'].set_position(('data',0))
plt.legend(loc='upper left', frameon=False)
for label in ax.get_xticklabels()+ax.get_yticklabels():
label.set_fontsize(16)
label.set_bbox(dict(facecolor='green', edgecolor='None', alpha=0.2))
plt.savefig("figures/exercise10.png", dpi=120)
plt.show()
那么,如何在情節上方設置刻度線標簽?
謝謝!
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