例4绘制曲线 t=(0:0.1:2*p X=t * sin(3*t) y=tsin(t)·sin(t) plot(x, y)例4 绘制曲线 t=(0:0.1:2*pi); x=t.*sin(3*t); y=t.*sin(t).*sin(t); plot(x,y) -6 -4 -2 0 2 4 6 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5