Hi Oliver K 946
The objective function is the variation of the function f (function ripple) : f[max]-f[min])/fmoy.
Hi hirnyk 497
First, thanks a lot for your reply and help.
In my example, it is not necessary to have f[max]=-f[min].
The problem is in NLPSolve or Search, the objective function f[max]-f[min])/fmoy is constituated with three variables in the same time with respet to ranges and constraints and are not separables, I think.
If you look in your programm, a, b, c, .. for fmax, fmin, and taux are different.
I must get a unique a, b, c... for objective function which is f[max]-f[min])/fmoy.
Search or NLPSolve must calculate at the same time with values of constraints and ranges, fmax, fmin, fmoy and f[max]-f[min])/fmoy and to minimize it and then to give the values of parameters.