Constrains

Hello,

I am uisng minuit2 and FunctionMinimum.
To define my function I use the operator () but it is a virtual method:
double operator () (const std::vector<double>&) const ; and I cannot modify the parameter inside this method, whilst I need to put a constrain to some of them.
For example par [1] = 1 - par [2].
I let par [1] be variable and fix par [2]. How can I put a constrain on some parameters ?

Thank.

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  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |    email: pd520_at_york.ac.uk


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