matlab画图图例

在Matlab中，可以使用legend函数来为图像添加图例。legend函数的格式为legend('string1','string2',...)，其中'string1'、'string2'等是用于标注各个数据组的实际意义的字符串。例如，如果我们在一张图中绘制了三条曲线，可以使用以下代码为它们添加图例：

x = 0:0.02*pi:2*pi; 
y1 = sin(x); 
y2 = cos(x); 
y3 = sin(3*x).*cos(x); 
plot(x,[y1;y2;y3]) 
legend('sin(x)','cos(x)','sin(3x)cos(x)')

这样，图例中会显示出三个标签分别对应着这三条曲线。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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