Rebinning to variable bin size

[will.flanagan]

Hi ROOT experts,

It is possible this is a trivial question, but I am having a hard time rebinning histograms from a uniform to variable bin size. I have been looking at the Rebin and RebinAxis documentation, but am not sure if this can do what I want.

It looks like this question may have been asked before and left unanswered:

Rebin histogram to a variable bin size

Hello, I searched this forum for previous posts but did not get something which specifically answers this: is it possible using TH1::Rebin() to rebin a histogram having uniform bin sizes to a histogram with varibale bin size (of course each new bin size being an integral multiple of the old bin size)? The ROOT documentation seems to hint that it is possible, but doing it has no effects on the bin size of the histo I want to rebin and no error thrown up. Code: TH1F* h1 = new TH1F(“h1”,“h1”,…

To be concrete, I have a histogram with 500 bins. I’d like to merge the last 300 bins and perhaps merge bins 150-200 as well.

Thanks in advance,
Will

[brun]

see documentation of TH1::Rebin at root.cern.ch/root/html/TH1.html#TH1:Rebin
see case 2

Rene

[will.flanagan]

Hi Rene,

Yes, that is what I was looking for. Thanks for the quick reply!

Will