Two exponential curve fitting

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Nancy
Nancy le 17 Déc 2011
Réponse apportée : Ada Verónica Elizabeth le 20 Fév 2024
Hi all,
I want to fit my data to a particular type of equation and get the values of the constant. The function is of the following form
F= A*exp(-B*x)-C*exp(-D*x)
I wish to find the values of A, B, C and D. How do I go about doing this in Matlab.
Thanks for the help.
Nancy

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Réponses (2)

Andrew Newell
Andrew Newell le 17 Déc 2011
You'll find this problem described on this support page.
Ada Verónica Elizabeth
Ada Verónica Elizabeth le 20 Fév 2024
Using the data x,F where x is the ordered set of independent values and F is the data corresponding to:
Model = fit(x,F,"exp2");
values = coeffvalues(Model);
values %contains coefficients a,b,c,d for F=a*exp(b*x)+c*exp(d*x)
a= values(1)
b= values(2)
d= values(3)
d= values(4)

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