TGraph::GetMaximum() asks for more explanation. In this example const float x[3] = {0.0, 1.0, 2.0}; const float y[3] = {1.0, 1.1, 0.9}; TGraph * gr1 = new TGraph(3, x, y); printf("gr1 maximum %f\n", gr1 -> GetMaximum()); one would expect the printed value to be 1.1. Instead it is -1111.00…

TGraph::GetMaximum()

Wile_E_Coyote November 16, 2021, 8:06am 2

Why the value of TGraph::GetMaximun() always equal to -1111? ROOT

TGraph::GetMinimum and TGraph::GetMaximum return the “minimum” and “maximum” values for plotting along “y”. The default values (-1111) mean that the drawing routine is free to choose whatever it likes.

Full width at half maximum for TGraph ROOT

TGraph::GetHistogram always returns a completely “empty” histogram, which is only used to draw the axes. In general, you would need to take the array pointers returned by TGraph::GetX and TGraph::GetY (together with the array sizes returned by TGraph::GetN) and then use some standard C++ functions to find FWHM (just make sure that you TGraph::Sort it first). If your graph is a scatter-plot of some “well defined” known distribution, then you could use TGraph::GetRMS (and TGraph::GetMean, if nee…

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