i want to do non linear fitting using the function y=ae^(-bt) + C
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
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.
0 commentaires
Réponses (1)
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!
2 commentaires
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.
Voir également
Catégories
En savoir plus sur Linear and Nonlinear Regression dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!