matplotlib 中fill_between

#有换行，黏贴的文本

plt.fill_between(x,x>0,c,c>0.5,color="green")
c,s两个三角函数
到底怎么填充的啊
我觉得如图才对

#下面是代码

# -*- coding: utf-8 -*-

"""

Spyder Editor

This is a temporary script file.

"""

import numpy as np

import matplotlib.pyplot as plt

plt.title("biao嗯ti")

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,label="cos")

plt.plot(x,s,label="sin")

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.yticks([1,0.5,0,-0.5,-1])

#plt.xticks([-np.pi,-np.pi/2,0,np.pi/2,np.pi],

#           ["-π","π/2","0","π/2","π"])

plt.legend(loc="upper left")

ax.xaxis.set_ticks_position("bottom")

plt.fill_between(x,x>0,c,c>0.5,color="green")

plt.show()