Python使用matplotlib绘制正弦和余弦曲线的方法示例

 import numpy as np import matplotlib.pyplot as plt #line x=np.linspace(-np.pi,np.pi,256,endpoint=True) #定义余弦函数正弦函数 c,s=np.cos(x),np.sin(x) plt.figure(1) #画图，以x为横坐标，以c为纵坐标 plt.plot(x,c,color="blue",linestyle="-",label="COS",alpha=0.5) plt.plot(x,s,"r*",label="SIN") #增加标题 plt.title("COS & SIN") ax=plt.gca() ax.spines["right"].set_color("none")<div style="color:transparent">来源gaodai^.ma#com搞#代!码网</div> ax.spines["top"].set_color("none") ax.spines["left"].set_position(("data",0)) ax.spines["bottom"].set_position(("data",0)) ax.xaxis.set_ticks_position("bottom") ax.yaxis.set_ticks_position("left") plt.xticks([-np.pi,-np.pi/2,0,np.pi/2,np.pi], [r'$-\pi$',r'$-\pi/2$',r'$0$',r'$+\pi/2$',r'$+\pi$']) plt.yticks(np.linspace(-1,1,5,endpoint=True)) for label in ax.get_xticklabels()+ax.get_yticklabels(): label.set_fontsize(16) label.set_bbox(dict(facecolor="white",edgecolor="None",alpha=0.2)) #图例显示 plt.legend(loc="upper left") #显示网格 plt.grid() #显示范围 #plt.axis([-1,1,-0.5,1]) plt.fill_between(x,np.abs(x)0.5,color="green",alpha=0.25) t=1 plt.plot([t,t],[0,np.cos(t)],"y",linewidth=3,linestyle="--") plt.annotate("cos(1)",xy=(t,np.cos(1)),xycoords="data",xytext=(+10,+30), textcoords="offset points",arrowprops=dict(arrowstyle="->",connectionstyle="arc3,rad=.2")) #显示图形 plt.show()