matplotlib-设置坐标轴2

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代码

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import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(-3, 3, 50)
y1 = 2*x + 1
y2 = x**2

plt.figure()
plt.plot(x, y2)
# plot the second curve in this figure with certain parameters
plt.plot(x, y1, color='red', linewidth=1.0, linestyle='--')
# set x limits
plt.xlim((-1, 2))
plt.ylim((-2, 3))

# gca = 'get current axis'
ax = plt.gca()
# 取消右边框和上边框
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
# 设置x,y轴
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
# 移动x,y轴
ax.spines['bottom'].set_position(('data', 0))
ax.spines['left'].set_position(('data',0))

plt.show()

结果