Using Rfunctions in Root

To install do the following:

1. root_rfn.tar.gz: extract the tar file, it creates a directory: root_rfn
2. cd there and run make
3. run the command: root macros/mkrfn : this will create the root files which contain the r-function cut data
4. copy the file rfn.root to the directory where you run your analysis

// load rfn library

gSystem->Load("./libRfn2.so");

// get rfn root-file contains all r-functions

TFile *r_file = new TFile("./rfn.root");

// get the proper r-function objects

// new righ arm collimator out

THaRfn rfn_r_o = (THaRfn)r_file->Get("2002042616-0-1");

// new left arm collimator out

THaRfn rfn_l_o = (THaRfn)r_file->Get("2002042616-0-0");

now the r-functions can be evaluated:

// calculate r-values using MCEEP output variables

// you need to do the proper unit conversions: