Retrieving axis values from bin center or bin number

[bellenot]

I’m sure @couet knows how to retrieve those values. But did you try to search the forum? For example:

Get coordinates around TH2 bin contents

What are some ways I can find the Xmin, Xmax, Ymin, Ymax coordinates of a box that surrounds the rectangle of bins in this plot? [image]

FindBin

…So I was trying to have a histogram that would serve as sort of an array. In other words I was trying… TH2F eff (“eff”,"",32,-3.2,3.2,16,0,.6); …then I fill the appropriate values from a text file into the TH2F by doing… ifstream fin; fin.open(“Efficiencies.t”); float a, b, c; fin >> a; fin >> b; fin >> c; eff.SetBinContent(eff.FindBin(a,b),c); …where a and b are not bin values, rather coordinates on the x and y-axis. Similarly I want to recall these values by inputting some variables…