Hi all,
I was wondering if ROOT allows for something like the following
TH1D *h1d = new TH1D("h1d","h1d",10,0,10);
TAxis *oneD_Xaxis = h1d->GetXaxis();
TH2D *h2d = new TH2D("h2d","h2d",oneD_Xaxis->GetNbins(),oneD_Xaxis->GetXbins(),5,0,5);
which I would expect to be the same as
TH2D *h2d = new TH2D("h2d","h2d",10,0,10,5,0,5);
Thanks
Try:
std::cout << oneD_Xaxis->GetXbins()->GetSize() << std::endl;
dashing, no
Well, you’d better read about “fix” versus “variable” bin size histograms.
So does this mean that the functionality I am looking for does not exist yet in ROOT?
If you mean fixed width versus variable bin width i understand the difference there, but I do not see how that applies to what I am saying here. In my first example ‘h1d’ I am using fixed bin widths.
For ‘h2d’ , and this is the subject of my question, I am attempting to combine the definition of a variable bin width histogram and a fixed bin width histogram. My real question is, can you use a constructor like that?
Found the answer to my problem, I will post the useful response here
TH1D *h1d = new TH1D("h1d","h1d",10,0,10);
TAxis *oneD_Xaxis = h1d->GetXaxis();
TH2D *h2d = new TH2D("h2d","h2d",oneD_Xaxis->GetNbins(),oneD_Xaxis->GetXbins()->GetArray(),5,0,5);
Try:
std::cout << oneD_Xaxis->GetXbins()->GetArray() << std::endl;