>>>>>>>>> now I included the test program (sorry!)
Dear rooters,
I have encountered the following "unexpected" beaviour
of a TH1F histogram:
I create a TH1F object and fill it with a set of (x,y) data points,
the y coordinate being used "as a weight".
I find that, as long as the minimum among the y values is negative,
the vertical axis range is automatically set centered on the y values
Instead, if the minimum among the y values is positive
(no matter how big it is),
the vertical axis first value is always set to 0. !!
Below I pasted my test program,
just try to switch OffSet between +10. and -10.
Is this the way it is supposed to work?
...or am I missing something ??
How I can have the vertical range centered on y values also in the
second case??
Thank you,
Irene
>>>>>>>>>>>>>>>>> test program
void test_range()
{
TCanvas *c1 = new TCanvas("c1","This is a TEST",600,400);
TH1F *h1 = new TH1F("h1","my histogram",100,0.,100.);
Int_t i;
Float_t OffSet = +10.; // -10.
for (i=0;i<100;i++) h1->Fill(float(i), OffSet + gRandom->Gaus(0,1));
h1->Draw();
c1->Update();
}
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