绘制曲线图

from pylab import *


figure(figsize=(8,6),dpi=80)

subplot(1,1,1)

X = np.linspace(-np.pi,np.pi,256,endpoint=True)
C,S = np.cos(X),np.sin(X)
plot(X,C,color = "blue",linewidth = 1.0,linestyle = \'-\')
plot(X,S,color = "green",linewidth =1.0,linestyle = \'-\')

plt.xlim(X.min()*1.1, X.max()*1.1)
plt.ylim(C.min()*1.1,C.max()*1.1)


xlim(-4.0,4.0)
xticks(np.linspace(-4,4,9,endpoint=True))
ylim(-1.0,1.0)
yticks(np.linspace(-1,1,5,endpoint=True))

xticks([-np.pi, -np.pi/2,0,np.pi/2,np.pi])
yticks([-1,0,+1])

ax = 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))


show()