Dear rooters,

I have a TF2 resulted from a fit to a TGraph2D. From that TF2 I would like to get, for a given X, the value of the Y for a given function value.

For a TF1 I usually get the roots of a function calling the TF1->GetX(py).

Could please someone let me know if there is a similar method for calculating one of the variables of a TF2 for a given value of the function?

Many thanks.

Best regards,

Jorge