例6分析下列程序绘制的曲线 xl=inspace(0,2 *pi) X 2=linspace(0, 3*pi) X3=linspace(0, 4 pi) yl=sin(xl); y2=1+sin(x2) y3=2+sin(x3); x=x1;x2;x3’; y=lyl;y2; y3; plot(x, y, xl, yl-1)例6 分析下列程序绘制的曲线. x1=linspace(0,2*pi); x2=linspace(0,3*pi); x3=linspace(0,4*pi); y1=sin(x1); y2=1+sin(x2); y3=2+sin(x3); x=[x1;x2;x3]'; y=[y1;y2;y3]'; plot(x,y,x1,y1-1)