Use the functions in TMath like TMath::LocMin, LocMax to find the index of the min/max element of an array, eg, assuming TGraph *gr; int n = gr->GetN(); double* y = gr->GetY(); int locmax = TMath::LocMax(n,y); double tmax = y[locmax]; To add a constant, do: for (int i=0;i<n;i++) y[i] += constant; Rene Brun Avdhesh Chandra wrote: > > Hi, > > How I can get a min. and max. of Y axis on a graph? and How I can shift > only Y points to a new value(may be after adding a constant), (without > changing X, values). > > Thanks for any help, > Avdhesh
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