matlab多元曲线拟合
时间: 2023-08-28 16:21:17 浏览: 130
在MATLAB中,可以使用多元非线性回归方法或cftool拟合工具箱来进行多元曲线拟合。在多元非线性回归方法中,可以使用scatter函数绘制散点图,然后使用nlinfit函数进行拟合。具体步骤如下:
1. 绘制散点图:
scatter(unnamed(:,1),unnamed(:,2),10,'r','filled')
2. 定义拟合函数:
myfunc = inline('beta(1).*sign(x) + beta(2).*x','beta','x');
3. 使用nlinfit函数拟合数据:
beta0=[0.5,0.5]';
beta=nlinfit(x,y,myfunc,beta0)
其中,x和y是需要拟合的数据。
4. 绘制拟合曲线:
for i=1:length(x)
y(i)=beta(1)*sign(x(i)) + beta(2)*x(i);
end
hold on
plot(x,y,'LineWeight',2)
另外,MATLAB还提供了cftool拟合工具箱,可以选择不同的拟合方法,如线性拟合、多项式拟合、自定义函数拟合等。具体使用方法请参考MATLAB官方文档或相关教程。
参考资料:
https://blog.csdn.net/qq_42895594/article/details/105833888
https://blog.csdn.net/ljyljyok/article/details/81624496
https://jingyan.baidu.com/article/67508eb40d47b09cca1ce4ce.html<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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