i want to do non linear fitting using the function y=ae^(-bt) + C
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I want to fit the non linear data using the function mentioned above. how do i get the values of a,b, & c. I have attached the text file which has my data.
Thank you.
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Nade Sritanyaratana
le 4 Août 2014
Have you already parsed t and y from the text file?
I would suggest custom nonlinear fitting since it looks like you want to fit an exponential curve with a constant additive term. Here's a doc page about using CFTOOL to do this.
For example, for the function you are using, I would define a fittype like this:
f = fittype( @(a, b, C, t) a*exp(-b*t) + C);
coeffs = fit(t, y, f);
a = coeffs.a;
b = coeffs.b;
C = coeffs.C;
Make sure that t and y are column vectors. Good luck!
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Nade Sritanyaratana
le 4 Août 2014
What do t and y look like? Can you print the output of both?
You will need to convert t and y to column vectors but the method to do so will depend on how they are currently stored.
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