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demo3.py
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31 lines (24 loc) · 797 Bytes
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# -*- coding: utf-8 -*-
"""
设置坐标轴
"""
import matplotlib.pyplot as plt
import numpy as np
# 绘制普通图像
x = np.linspace(-1, 1, 50)
y1 = 2 * x + 1
y2 = x**2
plt.figure()
plt.plot(x, y1)
plt.plot(x, y2, color = 'red', linewidth = 1.0, linestyle = '--')
# 设置坐标轴的取值范围
plt.xlim((-1, 1))
plt.ylim((0, 3))
# 设置坐标轴的lable
#标签里面必须添加字体变量:fontproperties='SimHei',fontsize=14。不然可能会乱码
plt.xlabel(u'这是x轴',fontproperties='SimHei',fontsize=14)
plt.ylabel(u'这是y轴',fontproperties='SimHei',fontsize=14)
# 设置x坐标轴刻度, 之前为0.25, 修改后为0.5
#也就是在坐标轴上取5个点,x轴的范围为-1到1所以取5个点之后刻度就变为0.5了
plt.xticks(np.linspace(-1, 1, 5))
plt.show()