matlab双y轴插值
时间: 2024-08-20 22:00:42 浏览: 57
在MATLAB中,双Y轴插值通常用于在同一图表上展示两个不同类型的数据,每个数据系列需要独立的Y轴范围。这可以使用`yyaxis`函数配合`interpn`或`griddata`等插值工具来实现。
1. `yyaxis`命令:首先,你需要设置主Y轴(默认),然后添加副Y轴。例如:
```matlab
figure;
yyaxis left; % 设置为主Y轴
plot(x1, y1, 'r'); % 第一个数据系列
yyaxis right; % 添加副Y轴
plot(x2, y2, 'b'); % 第二个数据系列
```
2. `interpn`:对于二维数据插值,你可以先对每个数据系列分别进行插值,然后再分别绘制到各自的Y轴上。例如:
```matlab
x1 = ...;
y1 = ...;
x2 = ...;
y2 = ...;
yi1 = interpn(x1, y1, xi); % 对第一个数据系列进行插值
yi2 = interpn(x2, y2, xi); % 对第二个数据系列进行插值
hold on;
plot(xi, yi1, 'r', 'LineWidth', 2); % 主Y轴上的线
plot(xi, yi2, 'b', 'LineWidth', 2); % 副Y轴上的线
```
3. `griddata`:如果你的数据是离散的点,可以使用`griddata`生成网格后再绘制:
```matlab
[xi, yi] = meshgrid(x1, x2); % 创建网格
yi1 = griddata(x1, y1, yi, 'linear'); % 主Y轴数据插值
yi2 = griddata(x2, y2, yi, 'linear'); % 副Y轴数据插值
plot(xi, yi1, 'r', 'LineWidth', 2);
plot(xi, yi2, 'b', 'LineWidth', 2);
```
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