Define multiple starting points for two-exponential curve fitting (Curve Fitting Toolbox)

Question

J.S. 2018-6-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/406863-define-multiple-starting-points-for-two-exponential-curve-fitting-curve-fitting-toolbox

回答： Adam Danz 2018-7-26

Hi,

I have a set of data on which I need to use the two-exponential decay model 'exp2' from the Curve Fitting Toolbox. When I attempted to call the "fit" function ( f=fit(xCol,yCol,'exp2','StartPoint',[maxX,maxY])), MATLAB told me I needed 4 starting points for this model. What is the proper syntax for specifying these? I tried:

f=fit(xCol,yCol,'exp2','StartPoint',[maxX1,maxY1,maxX2,maxY2,maxX3,maxY3,maxX4,maxY4])), but MATLAB told me I had too many start points.

Thanks in advance!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Adam Danz 2018-7-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/406863-define-multiple-starting-points-for-two-exponential-curve-fitting-curve-fitting-toolbox#answer_330510

在 MATLAB Online 中打开

If you're fitting a 2-term exponential model such as

f2(x) = a*exp(b*x) + c*exp(d*x)

you'll need 4 starting points (a,b,c,d). In your examples above, you provide 2 and 8 starting points. Your formatting them correctly into a vector but you just need 4 of them.

For more info, see the section " Fit a Two-Term Exponential Model ".