Hi Tancredi, We do not have a TGraphErrors::Divide function. However, after some gymnastic, you should be able to do the job via TGraphAsymmErrors::BayesDivide or the corresponding TGraphAsymmErrors constructor. See the description of this function at: http://root.cern.ch/root/htmldoc/TGraphAsymmErrors.html#TGraphAsymmErrors:BayesDivide You will have to transform your TGraphErrors to histograms before using this function. A direct interface TGraphAsymmErrors::Divide taking two TGraphs as input could be implemented. I am ccying this mail to Andy Haas the author of BayesDivide. Andy, would you like to implement TGraphAsymmErrors::Divide ? Rene Brun Tancredi Carli wrote: > > Hello, > > I have two objects of type TGraphErrors, let's say TG1 and TG2 > and I would like to divide them, e.g. TG3=TG1/TG2 and get > the correct error treatment. Is there an function for this > operation which I overlooked ? > > ..or do I have to get the values at each point by GetPoint > make the division, calculate the error, create new objects > and set the points ? > > Thank you for you help. > > Tancredi Carli > > -- > > +-------------------------------------------------------------------+ > | Tancredi Carli tancredi.carli@cern.ch | > | CERN, Division EP phone ++41 22 767 9606 | > | CH-1211 Geneva 23 Room 40-1-C06 | > +-------------------------------------------------------------------+
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