Re: TAxis strange behaviour

Simone,

TAxis hold the bins. On a 1D histogram you have bins only along the X axis.

That's why the Y axis behaves differently, it does not really exist until you plot the histo.

Now the 2nd recipe I gave you works even without plotting the histo.

Olivier

-----Original Message-----

From: Simone Bifani

Sent: Wednesday, March 23, 2011 2:47 PM

To: Olivier Couet

Cc: roottalk (Mailing list discussing all aspects of the ROOT system.)

Subject: Re: [ROOT] TAxis strange behaviour

  Hi,

because I need the y-axis maximum to create a TGaxis I did the following to temporary solve this problem

   hCL->GetYaxis()->SetRangeUser(1.e-1, 4. * hCL->GetMaximum());

   TGaxis *aEta = new TGaxis(hCL->GetXaxis()->GetXmin(),

hCL->GetMaximum(), hCL->GetXaxis()->GetXmax(), hCL->GetMaximum(), 2.,

4.5, 5, "-");

However it seems quite misleading to me that SetRangeUser changes the histogram Maximum but not the YAxis Xmax

Nevertheless I suppose you should check the GetYaxis()->GetXmax() behaviour as I believe it is not working as it should

Thanks,

s. Received on Thu Mar 24 2011 - 10:22:14 CET