Re: TTree::Draw bug?

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 - 09:39:08 MET