1、首先，我们创建籼瑜尬鲞六条曲线，分两次绘制曲线x = 0 : 0.01 : 4*pi;y1 = sin(x);y2 = cos(x)稆糨孝汶;y3 = 3*cos(x);y4 = cos(x).*sin(x);y5 = cos(x) + sin(x);y6 = cos(x) - 2*sin(x);h1 = plot(x,y1,x,y2,x,y3);hold onh2 = plot(x,y4,x,y5,x,y6);
3、接下来我们添加图例legend('s坡纠课柩in(x)','cos(x)','3cos(x)','cos(x)*sin(x)','cos(x) + sin(x)','cos(x) - sin(x)')观察每条曲线的颜色，如图
5、运行程序，观察结果
6、注意我们画图时要记录句柄值，例子中的h1,h2
