import?numpy?as?np

import?matplotlib.pyplot?as?plt

x?=?np.linspace(-np.pi,np.pi,256,endpoint=True)

c,s=np.cos(x),np.sin(x)

plt.figure(1)
plt.plot(x,c)
plt.plot(x,s)
plt.title('SIN&COS')
ax=plt.gca()
ax.spines["right"].set_color("none")
ax.spines["top"].set_color("none")
ax.spines["left"].set_position(("data",0))
ax.spines["bottom"].set_position(("data",0))
plt.show()

引入 numpy了嗎？