How to best fit a curve to my data
2 次查看(过去 30 天)
显示 更早的评论
Hi, I have 2 variables (attached in the file myXY.mat) to which I would like to fit a curve.
I'm expecting to receive something like this (the pic is manually drawn):
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/167270/image.png)
Here's my code:
f = fit(X,Y,'exp1')
plot(f,X,Y)
And here's what I get:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/167271/image.png)
Any ideas what the code should be to receive a fit more similar to what I drew?
2 个评论
采纳的回答
更多回答(1 个)
Rik
2017-12-5
You need to change the starting guesses and you might have to adjust the function itself.
x=0:0.01:10;
y=1-exp(-x);
plot(x,y)
The code above will result in a similar shape of what you are asking. 'exp1' will support this, except for the offset. You can provide your own function instead by using the anonymous function input.
PS you need to make sure that for your application, it is indeed an exponential function and not a (square) root.
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Get Started with Curve Fitting Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!