Dear Rene,
Thak You for Your prompt answer.
I think my question was a little bit confusing...
Let me clearify what I ment by an "empty" histogram...
The GetEntries() returns also under and over flows while the "content"
(i.e. data which might tell You something else than if the
entry went outside the histogram limits...:)) - that is not interesting
for me... I thought there might be a smart to check if there´s something
inside the histo bounds.
Please consider following:
1)
{
TH1F a("a","a",10,0,9);
a.Fill(5, -1);
a.Fill(6, 1);
a.GetEntries(); // = 2
a.GetSumOfWeights(); // = 0
}
2)
{
TH1F a("a","a",10,0,9);
a.Fill(-10000);
a.Fill(100000);
a.GetEntries(); // = 2
a.GetSumOfWeights(); // = 0
}
... but the pictures are not comparable... :(
Of course one could have a look into Mean and RMS but, in strange cases
I think even this might not help...
There's also possibility to check the underflow && over bins but for
histo dim > 1 this makes some fuss... while I iterate on the TList when
checking... (fuss = I can call GetNbinsX(), ..Y, ..Z to get the numbers
and check the under and overflow bins and compare with GetEntries and so
on...)
Best regards,
Mateusz
--
Mateusz Ploskon
GSI Planckstrasse 1
D-64291 Darmstadt
Tel.: +49-6159-71-2914
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:11 MET