Hi Edmond, You are right... I was confused. The Lagrange multipliers method is to be use for constraints parameters within a fit and not for correleted parameters. I think I have to reformulate my functionnal and make some calculation after the fitting step to come back to the desire form. Regards, Sebastien Edmond Offermann wrote: > Hi Sebastien, > > Try to formulate your fitting function so that you minimize the > correlation between the parameters . After the fit you can always > transform into the shape you desire . Strong correlated parameters > will just lead to near-singular matrices in the solution engine. > > I only know of the usage of Lagrangian Multipliers to enforce > parameter equality constaints . If you know how to use them > in correlated parameter searches , please enlighten us :) > > Eddy
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