Hi,
sometimes TH1F with negative bin contents and SetNormFactor don’t go well together, e.g. here:
void testmacro() {
TCanvas* c=new TCanvas("c","c");
c->Divide(2,1);
TH1F* h=new TH1F("h","h",10,0.,1.);
for (Int_t i=0; i<10;i++)
h->SetBinContent(i+1,(5.-2*i)*((i%2)*2 -1));
h->SetNormFactor(1.);
c->cd(1);
h->DrawClone();
h->Scale(-1.);
c->cd(2);
h->Draw();
}
For subpad 1 I get the error message:
Error in <TPad::Range>: illegal world coordinates range: x1=-0.125000, y1=0.144375, x2=1.125000, y2=-1.299375
Error in <TPad::RangeAxis>: illegal axis coordinates range: xmin=0.000000, ymin=0.000000, xmax=1.000000, ymax=-1.155000
What’s the reason, am I expecting something that can’t work? Why does it work if it’s mirrored?
win32gcc, 4.00/03; linux, 4.00/03.
Cheers, Axel.