MATLAB中plot显示好多个重复图例的解决办法
时间: 2024-10-16 08:07:55 浏览: 96
在MATLAB中,如果你想要在一个图形上显示多个重复的图例,特别是在每个数据系列都有相同的标签时,可以按照以下步骤操作:
1. **创建数据和图线**:
```matlab
x = 0:0.1:10;
y1 = sin(x);
y2 = cos(x);
```
2. **使用`legend`函数**:
当有多个数据系列需要添加到同一个图形,并希望它们共享相同的图例时,可以在`plot`命令之后添加`legend`,并指定对应的标签。例如,如果你想表示y1和y2都属于“周期函数”这个类别,你可以这样做:
```matlab
plot(x, y1, 'b-', x, y2, 'r-');
legend('周期函数', '周期函数'); % 注意这里的标签都是"周期函数"
```
3. **使用`addlegend`函数**:
如果你已经有一个图例存在,并想添加新的数据系列,可以先生成一个空的图例,然后再添加新的图例项。例如:
```matlab
h1 = plot(x, y1, 'b-');
h2 = plot(x, y2, 'r-');
leg = legend(h1, '周期函数');
addlegend(leg, '周期函数'); % 这里再次添加相同的标签
```
4. **处理图例标题**:
如果你想设置图例的总体标题,可以使用`title`函数配合`Legend`对象:
```matlab
leg.Title.String = '周期函数'; % 添加图例标题
```
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