Re: TTree::Draw bug?

From: Andre Lebedev <lebedev_at_fas.harvard.edu>
Date: Wed, 29 Nov 2006 09:13:23 -0500


Hello.

I see this on Fedora 5 with ROOT 5.12/00f. I couldn't reproduce this on two other machines either, so I guess it's a peculiarity that I'll have to live with.

Thanks,
Andre.

Rene Brun wrote:
> Andre,
>
> I cannot reproduce this problem with either 5.12 or 5.13.
> You did not answer ma question about your vesrion of ROOT and OS.
>
> Rene
>
> Andre Lebedev wrote:
>> Rene,
>>
>> I can reproduce the problem typing the following at the command line:
>> root [0] TTree* tree = new TTree("tree", "tree")
>> root [1] double x, y
>> root [3] tree->Branch("x", &x, "x/D")
>> (class TBranch*)0x9f28478
>> root [4] tree->Branch("y", &y, "y/D")
>> (class TBranch*)0x9e92f08
>> root [5] x = 1e9
>> (const double)1.00000000000000000e+09
>> root [6] for (y = 0; y < 1000; y += 1) tree->Fill()
>> root [7] tree->Print()
>> ******************************************************************************
>>
>> *Tree :tree :
>> tree *
>> *Entries : 1000 : Total = 17475 bytes File Size
>> = 0 *
>> * : : Tree compression factor =
>> 1.00 *
>> ******************************************************************************
>>
>> *Br 0 :x :
>> x/D *
>> *Entries : 1000 : Total Size= 8610 bytes One basket in
>> memory *
>> *Baskets : 0 : Basket Size= 32000 bytes Compression=
>> 1.00 *
>> *............................................................................*
>>
>> *Br 1 :y :
>> y/D *
>> *Entries : 1000 : Total Size= 8610 bytes One basket in
>> memory *
>> *Baskets : 0 : Basket Size= 32000 bytes Compression=
>> 1.00 *
>> *............................................................................*
>>
>> root [8] tree->Draw("x")
>> <TCanvas::MakeDefCanvas>: created default TCanvas with name c1
>>
>> The canvas remains blank and I don't get the prompt back.
>>
>> Regards,
>> Andre.
>>
>> Rene Brun wrote:
>>> Andre,
>>>
>>> I cannot reproduce this problem with version 5.12 or 5.13.
>>> Coould you send a script and short data file reproducing this problem?
>>>
>>> Rene
>>>
>>>
>>> Andre Lebedev wrote:
>>>> Hello, ROOTers.
>>>>
>>>> I believe there is a bug in TTree::Draw() when the variable to be
>>>> drawn has no range. That is I have a tree where for some selection
>>>> of cuts one of the variables is 1e9. If I do
>>>>
>>>> swtest->Draw("x2[0]>>h(100,0,1.1e9)", "z<-830")
>>>>
>>>> everything goes through ok. However, if I do
>>>>
>>>> swtest->Draw("x2[0]", "z<-830")
>>>>
>>>> The code prints the number of events that pass the cut and then
>>>> hangs in
>>>> #0 0x0076b501 in isnan () from /lib/libm.so.6
>>>> #1 0x00768a5b in pow () from /lib/libm.so.6
>>>> #2 0x0195009c in TGaxis::PaintAxis ()
>>>> from /usr/local/mipp/extern/root-5.12.00f/lib/libGraf.so
>>>> #3 0x01c45f95 in THistPainter::PaintAxis ()
>>>> from /usr/local/mipp/extern/root-5.12.00f/lib/libHistPainter.so
>>>> #4 0x01c428a3 in THistPainter::Paint ()
>>>> from /usr/local/mipp/extern/root-5.12.00f/lib/libHistPainter.so
>>>> #5 0x02063775 in TH1::Paint ()
>>>> from /usr/local/mipp/extern/root-5.12.00f/lib/libHist.so
>>>>
>>>> I am running ROOT 5.12/00f on gcc 4.1.1. However, I don't see the
>>>> same problem in ROOT 5.10/00 built on gcc-3.3.4.
>>>>
>>>> Regards,
>>>> Andre.
Received on Wed Nov 29 2006 - 15:13:43 MET

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