Hello, I’m trying to write a function that return an array of TH1D histograms. I follow a post on stackoverflow, which recommended using malloc to create the array of histograms. I follow the instruction and my code works. The code I wrote is as follow: TH1D** *array_of_hists( ) { TH1D** *hist …

Hi @LongHoa , [image] LongHoa: TH1D** *hist = ( TH1D*** )malloc( sizeof(TH1D)*2 ); I guess that you are referring to a couple of asterisks you removed in sizeof(TH1D**). The rest of the explanation will just assume that. In the code above, the original line allocates enough space on the hea…

Wile_E_Coyote November 22, 2022, 11:11am 2

Correct way to write a function that return an n-dimensional array of TH1 objects