When you don't know the range of the histogram


How can you define a TH1 without specifying the range of the x-axis, which should be by default equal to the last entries on the left and right of the histogram?


Try to set xmin and xmax to 0. For example:

auto h1 = new TH1F("h1", "my histo", 100, 0, 0);

Thank you very much!

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