Set parameter limits or set constraint?

ROOT
1

Hello folks,

Suppose I am fitting a histogrma by a function of three variables: A, B, C. Setting limits on one one parameters is quite simple: using SetParLimits.

I need to know how to do it for a combination of these paramters, i.e. set a constraint. For example set the parameter limit on “A*B”.

I can do some coding trick, but I am not sure if we can do it with root facilities.

              Ahmed
2

Hi,

This can be implemented in a straight-forward way using Lagrangian
multipliers and Minuit . It is spelled out step-by-step in the last part
of

/afs/cern.ch/user/e/eddyo/public/matrix/report/compareLinAlg.pdf

This will be implemented in the future as a standard option in Minuit .

Eddy