用Matlab的数值计算方法编程,在同一幅图中画出几个函数图象.

clear allclcx=0:0。1:5*pi;y1=10/sqrt(1-0。5^2)*exp(-0。5*x)。*sin(5*x);y2=10/sqrt(1-0。5^2)*exp(-0。5*x);y3=-10/sqrt(1-0。5^2)*exp(-0。5*x)plot(x,y1,'r-',x,y2,'g-。',x,y3,'k')title('stuid+stuname');xlabel('振荡时间x');ylabel('振荡函数幅度值');axis([0,14,-12,12]);text(0。5*pi,10/sqrt(1-0。5^2)*exp(-0。5*0。5*pi)。*sin(5*0。5*pi),'曲线f1');text(0。3*pi,-10/sqrt(1-0。5^2)*exp(-0。5*0。3*pi),'曲线f1的包络')