Can not use TGraph::Draw() and TGraphErrors::Draw()

Masayuki Eto (etoh@mail.kek.jp)
Tue, 07 Oct 97 16:42:41 +0900

Hi,

I modified root/tutorials/gerrors.C as following:

* Original
Int_t n = 10;
Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Float_t y[n] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Float_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};

* Modified
Int_t n = 5;
Float_t x[n] = {-0.800000, -0.400000, 0.000000, 0.400000, 0.800000};
Float_t y[n] = {204.263977, 201.577225, 199.746033, 198.477097, 197.912704};
Float_t ex[n] = {0.200000, 0.200000, 0.200000, 0.200000, 0.200000};
Float_t ey[n] = {0.467499, 0.350273, 0.337041, 0.345279, 0.449189};

I did not change other lines in this file. But this program did not
work because of "*** Break *** floating point exception".

I also tried TGraph::Draw() with same data, but it did not work too.

I tried root-1.03/04-cxx and root-1.03/04-g++ on DEC OSF1-Ver4.0.

Why these did not work?

Thanks.

---
Masayuki Eto (etoh@mail.kek.jp)
Dep.Phys., Tohoku Univ.