matlab fill legend
时间: 2023-07-20 11:40:05 浏览: 62
To add a legend to a filled area plot in MATLAB, you can use the `legend` function after creating the plot. Here's an example:
```matlab
x = 0:pi/100:2*pi;
y1 = sin(x);
y2 = cos(x);
fill([x fliplr(x)], [y1 fliplr(y2)], 'r');
hold on;
plot(x, y1, 'b');
plot(x, y2, 'g');
legend('Filled area', 'Sine', 'Cosine');
```
This code will create a filled area plot with a red color, and then add two sine and cosine plots on top of it. The `legend` function is then used to add a legend to the plot with labels for each of the three plots. You can customize the legend further using additional arguments to the `legend` function.
相关问题
use fill but not legend
If you want to label the filled area itself without using a legend in MATLAB, you can use the `text` function to add a label directly to the plot. Here's an example:
```matlab
x = 0:pi/100:2*pi;
y1 = sin(x);
y2 = cos(x);
fill([x fliplr(x)], [y1 fliplr(y2)], 'r');
text(mean(x), mean([y1, y2]), 'Filled area', 'HorizontalAlignment', 'center');
```
In this code, the `fill` function is used to create a filled area plot with a red color. Then, the `text` function is used to add the label "Filled area" to the center of the plot using the mean value of the `x` and `y` coordinates. The `'HorizontalAlignment', 'center'` argument is used to center the label horizontally. You can adjust the position and style of the label by adjusting the arguments to the `text` function.
matlab smooth
在MATLAB中,可以使用`smooth`函数对数据进行平滑处理。该函数的语法如下:
```
y = smooth(x,span,'type')
```
其中,`x`为待平滑的数据,`span`为平滑窗口的大小,`type`为平滑类型,可以取以下值:
- `'moving'`:移动平均法;
- `'lowess'`:局部加权回归平滑法;
- `'loess'`:局部加权回归平滑法;
- `'sgolay'`:Savitzky-Golay滤波器;
- `'rlowess'`:加权回归平滑法;
- `'rloess'`:加权回归平滑法。
例如,以下代码使用移动平均法对数据进行平滑处理:
```matlab
x = rand(1,100);
y = smooth(x,10,'moving');
plot(x);
hold on;
plot(y);
legend('Original data','Smoothed data');
```
其中,`x`为随机生成的一维数组,长度为100,`span`设置为10,`type`为`'moving'`。运行结果如下所示:
![smooth_result](https://img-blog.csdn.net/20180412112117323?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY29tbWFuZGVyXzIwMTgwNzA1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/q/85)