Nonlinear regression/fitting

Hello everybody,

I am searching for a source code in C/C++ of a regression algorithm to calculate the regression coefficients.

I already built a model function. The value of the model function depends on 3 parameters:


The maximum order of the parameter is the 5th one.
The model function needs o be fitted to datas from measurements.

Has anybody already writen a programm for this topic or knows where to get it???

Thank you very much!
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