Nonlinear regression/fitting

Hello everybody,

I am searching for a source-code in C/C++, in which a regression algorithm is implented to calculate the regression coefficients.

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


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

Has anybody already writen a programm like this or knows where to get a code for my problem?

Thanks a lot!

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