Non Linear Curve Fitting

[LucaMatulli]

Dear All,

I am using the Non Linear Curve Fitting Lev-Mar :formula string , but I have some problem for the sintax of the model description function.

I have written as follow : a1*(e^(t-a2)/a3-e^(t-a2)/a4)      

where a1,a2,a3,a4,are the parameters, t is the time and e is the natural exponential function.

But I receive the error : Wrong Model Equation

Anybody can help me ?

Thanks

Luca

[altenbach · Accepted solution]

The natural exponentiation function is exp(x), not e^x.

(see also)