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I want to find the best coefficients for curve fitting for my experiment data
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Greetings
I have experiment data as you can see below, I want to find the curve with the formula of y=K0+K1exp(-t/Tau) which is fit to my experiments data.
I have 'y' and 't' from experiment and I am looking for the best values for K0, K1 and Tau.
the bellow is the graph of my experiment data
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1069670/image.jpeg)
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Accepted Answer
Image Analyst
on 18 Jul 2022
You can use fitnlm if you have the stats toolbox. See attached demo and make changes as needed, like reading in your actual data, and renaming variables if you want.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1069710/image.png)
More Answers (2)
Torsten
on 18 Jul 2022
Your code ?
Essential in your case is a good starting guess for the parameters.
Try the following code and take the coefficients as initial values for the optimization.
fun = @(K0,K1,tau,t) K0 + K1*exp(-t/tau);
t = 0:0.1:10;
K0 = 1e10;
K1 = 6.2e10;
tau = 4.5;
y = fun(K0,K1,tau,t);
plot(t,y)
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