ModifyInterpolation.C

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/*
An example script to modify the interpolation used in HistFactory models.
Usage:
 
make the standard example workspace with histfactory
$ prepareHistFactory
$ hist2workspace config/example.xml
 
inspect file (note we are using the model with Gaussian constraints)
$ root.exe results/example_combined_GaussExample_model.root
root [1] combined->Print()
 
notice there is a new class in the new version:
RooStats::HistFactory::FlexibleInterpVar::background1_channel1_epsilon[ paramList=(alpha_syst2) ] = 0.999209
 
You only need this macro if you don't want the CMS style normalization interpolation.
 
root [2] .L $ROOTSYS/tutorials/histfactory/ModifyInterpolation.C+
root [3] CheckInterpolation(combined)
[#1] INFO:InputArguments -- interp code for alpha_syst1 = 1
[#1] INFO:InputArguments -- interp code for alpha_syst2 = 1
[#1] INFO:InputArguments -- interp code for alpha_syst3 = 1
 
One can change the interpolation for a specific set of parameters
root [5] combined->set("ModelConfig_NuisParams")->Print()
RooArgSet:: = (alpha_syst2,alpha_syst3)
root [6] ModifyInterpolationForSet(combined->set("ModelConfig_NuisParams"),2)
root [7] CheckInterpolation(combined)
[#1] INFO:InputArguments -- interp code for alpha_syst1 = 1
[#1] INFO:InputArguments -- interp code for alpha_syst2 = 2
[#1] INFO:InputArguments -- interp code for alpha_syst3 = 2
 
Or one can change the interpolation type for all the parameters:
root [11] ModifyInterpolationForAll(combined,2)
root [12] CheckInterpolation(combined)
[#1] INFO:InputArguments -- interp code for alpha_syst1 = 2
[#1] INFO:InputArguments -- interp code for alpha_syst2 = 2
[#1] INFO:InputArguments -- interp code for alpha_syst3 = 2
 
and then you can save the workspace with those modifications
root [13] combined->writeToFile("testModified.root")
 
then test to make sure the changes are in the file
$ root.exe testModified.root
root [1] .L $ROOTSYS/tutorials/histfactory/ModifyInterpolation.C+
root [2] CheckInterpolation(combined)
[#1] INFO:InputArguments -- interp code for alpha_syst1 = 2
[#1] INFO:InputArguments -- interp code for alpha_syst2 = 2
[#1] INFO:InputArguments -- interp code for alpha_syst3 = 2
*/
#include "RooRealVar.h"
#include "TIterator.h"
#include "RooWorkspace.h"
#include "RooStats/HistFactory/FlexibleInterpVar.h"
 
using namespace RooStats;
using namespace HistFactory;
 
// define functions for ACLIC
void ModifyInterpolationForAll(RooWorkspace* ws, int code=1);
void ModifyInterpolationForSet(RooArgSet* modifySet, int code = 1);
void CheckInterpolation(RooWorkspace* ws);
 
// Codes for interpolation
// code = 0: piece-wise linear
// code = 1: piece-wise log
// code = 2: parabolic interp with linear extrap
// code = 3: parabolic version of log-normal
 
void ModifyInterpolation(){
  cout <<"Choose from the following"<<endl;
  cout <<"void ModifyInterpolationForAll(RooWorkspace* ws, int code=1);"<<endl;
  cout <<"void ModifyInterpolationForSet(RooArgSet* modifySet, int code = 1);"<<endl;
  cout <<"void CheckInterpolation(RooWorkspace* ws);"<<endl;
}
 
void ModifyInterpolationForAll(RooWorkspace* ws, int code){
  for (auto *flex : dynamic_range_cast<FlexibleInterpVar*>(ws->allFunctions())) {
    if(flex){
      flex->setAllInterpCodes(code);
    }
  }
}
 
void ModifyInterpolationForSet(RooArgSet* modifySet, int code){
 
  for (RooAbsArg *alpha : *modifySet) {
    for (auto *flex : dynamic_range_cast<FlexibleInterpVar*>(alpha->clients())) {
      if(flex){
         flex->printAllInterpCodes();
         flex->setInterpCode(static_cast<RooAbsReal &>(*alpha),code);
         flex->printAllInterpCodes();
      }
    }
  }
 
}
 
 
void CheckInterpolation(RooWorkspace* ws){
  for (auto *flex : dynamic_range_cast<FlexibleInterpVar*>(ws->allFunctions())) {
    if(flex){
      flex->printAllInterpCodes();
    }
  }
}