Does ROOT have a suitable analog for CERNLIB's divdif

Roofit and RooStats
#1

I’m converting some old fortran code to C++ and I’m having difficulty finding a good ROOT alternative (or any suitable c++ alternative in another library) for cernlib’s divdif routine (described here: cmd.inp.nsk.su/old/cmd2/manuals/ … de111.html)

Any suggestions are welcome! And an example implementation might be appreciated as well. Thanks so much!

#2

Hi,

You can use the Interpolation class in ROOT, available in the MathMore library.
The class is ROOT::Math::Interpolator,
see root.cern.ch/function-interpolation

and also the reference documentation at

root.cern.ch/doc/v606/classROOT … lator.html

Alternatively you can use the TGraph class and the TGraph::Eval method

Best Regards

Lorenzo