by default in roofit empty bins are plotted with markers and error bands (ie like when in root one plots with the E0 option). is there a way to turn this feature off and have “empty” empty bins?
i’ve seen this question posted several times, but failed to find an easy solution.
thanks a lot in advance
do you have a small reproducer ?
i didn’t have a simple example at hand so i copy-pasted from a roofit tutorial:
using namespace RooFit ;
RooRealVar x("x","x",-10,10) ;
RooRealVar mean("mean","mean of gaussian",1,-10,10) ;
RooRealVar sigma("sigma","width of gaussian",1,0.1,10) ;
// Build gaussian p.d.f in terms of x,mean and sigma
RooGaussian gauss("gauss","gaussian PDF",x,mean,sigma) ;
RooDataSet* data = gauss.generate(x,100) ;
RooPlot* xframe2 = x.frame(Title("Gaussian p.d.f. with data")) ;
TCanvas* c1 = new TCanvas("c1", "c1", 600, 600);
this produces test.eps, which has a lot of empty bins with markers and error bars:
[attachment=0]Screenshot 2016-02-24 10.35.20.png[/attachment]
Roofit has its own way of managing options. Saving your plot to a .C file I saw that the error bars are not produced using an histogram. Therefore the E0 you are looking for option is not active.
They are produced using a TGraphAsymError.
The error drawing options https://root.cern.ch/doc/master/classTGraphPainter.html#GP03 for graphs do not have that possibility. Which, if you think in term of graph, is normal.