TAxis::GetXbins does not always return bin edges

[Wile_E_Coyote]

For fix bin size histograms, histo->GetXaxis()->GetXbins()->GetArray() returns a “nullptr” (i.e. 0).

TAxis FixedToVariable and VariableToFixed proposal

I would like to propose that two methods are added to the TAxis class: FixedToVariable and VariableToFixed. So, an axis which was created as a “fixed bin sizes” one could be converted into a “variable bin sizes” one and the opposite. Note: in case of the “VariableToFixed” method, we would not preserve bin widths, only the “low-edge”, the “upper-edge” and the number of bins would be used / preserved. I guess I would like to have: FixedToVariable(Double_t *xbins = 0) FixedToVariable(Double_t x…