Dear Experts,
I would like to know how to get the variable index in a p.d.f.
My problem is that I need to use the covariance matrix obtained by
fitResult->covarianceMatrix()
( where fitResult is of type : RooFitResult )
In particular I need a specific element of the covariance matrix.
I know the two variable names for which I need the covariance term,
but I don’t know how to translate their names into the matrix indexes !
Many thanks for your support.
- Mauro.