Re: [ROOT] TH1D, getmean, getRMS, getMinimum...

From: Rene Brun (
Date: Wed Jun 02 2004 - 22:36:37 MEST

Hi Bernd,

I do not understand your question. All what you request is already
provided by the TH1 class.
Assuming TH1* h, you can do
  h->GetMinimum(minval); //Return minimum value greater than minval of 
     bins in the range
  h->GetMaximum(maxval); //Return maximum value smaller than maxval of 
     bins in the range
  h->GetXaxis()->GetXmin(), Xmax, Nbins, etc

Rene Brun

On Wed, 
2 Jun 2004, Bernd Reinhold wrote:

> Hi!
> Is there a way to get the following information from the histogram? (TH1D as
> input to the function (as reference), and as output the following infos:)
> mean, RMS, entries do work - that works with h1.GetMean(), h1.GetRMS,
> h1.GetEntries()
> minimum - I tried GetMinimum(), however this didn't work as expected. I want
> to have the minimum entry in the histogram, that is bigger than xmin.
> maximum - didn't work as expected, either...
> xmin, xmax, numberofbins (the last three parameters in the TH1D-constructor)
> thank you for your help, Bernd.

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