python 绘制分段函数图像

绘制分段函数:

      y = \left\{\begin{matrix} cos(x).....(0<x<30) & \\ x............(30\leq x <50)& \\ sin(x)......(50\leq x)& \end{matrix}\right.

首先导入matplotlib和numpy包:

import matplotlib.plot as plt
import numpy as np

规定x范围0-100,1000个点:

x = np.linspace(0,100,1000)

设置区间:

interval0 = [1 if (i<30) else 0 for i in x]
interval1 = [1 if (i>=30 and i<50) else 0 for i in x]
interval2 = [1 if (i>=50) else 0 for i in x]

列函数式:

y = np.cos(x)* interval0 + x * interval1 + np.sin(x)*interval2

绘图显示:

plt.plot(x,y)
plt.show()

结果:

python 绘制分段函数图像_第1张图片

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