Masayuki Eto wrote: > > 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. Thanks for reporting this problem. The problem was easily traced to be a protection problem in TH1::PaintHist. The bug appears only on alpha/unix. I have fixed the problem and generated the tar files for alpha machines (both cxx and g++) on our Web site. Rene Brun
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