Problems with exponential fit.
8 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I start with the following data:
x,y
0.0025,10
0.001818,100
0.001429,10000
And try to fit to rate=a*exp(bx) using the following code:
p=fit(x,y,'exp1');
p2=coeffvalues(p);
yfit=p2(1)*exp(p2(2)*x);
semilogy(x,y,'.',x,yfit)
and get a poor quality fit along with values that do not make sense. It really underestimates y for larger x.
Excel’s exponential fit seems reasonable.
Any ideas why the Matlab fit does not work. I was working with small x values so I multiplied by 1000 but it had no effect.
0 commentaires
Réponses (1)
Voir également
Catégories
En savoir plus sur Get Started with Curve Fitting Toolbox dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!