Re: TGraph2DErrors

Hi Lorenzo

you have far better understanding of ROOT code than me, but does it matter whether TGraph2D::SetPoint is declared as virtual or not if I am using TGraph2DErrors pointer (not the base class pointer).

Margar

On Mon, Mar 16, 2009 at 5:04 PM, Lorenzo Moneta <Lorenzo.Moneta_at_cern.ch> wrote:
> Hello Margar,
>
>  I think there is a bug in  the definition of TGraph2D::SetPoint. This
> function must be defined as virtual since it is  re-implemented by the
> TGraph2DErrors and presently it is not. We fill fix this in SVN.
>  Thank you for reporting this
>
>  Lorenzo
> On Mar 16, 2009, at 3:41 PM, Margar Simonyan wrote:
>
>> Hi Bakur
>>
>> yes, that is one solution. My understanding was that TGraph (2D) is a
>> dynamic object and internally extends the arrays when needed. In my
>> code at the time of creation of TGraph I don't know the number of
>> points, of course the points can be filled into dynamic array and when
>> the length is known one can create a TGraph with required number of
>> points.
>>
>> Thanks,
>>            Margar
>>
>> PS. sorry for double posting, in the past it was impossible to send
>> email to roottalk from gmail account
>>
>> On Mon, Mar 16, 2009 at 3:25 PM, Bakur Parsamyan <bakur_at_cern.ch> wrote:
>>>
>>> Hi Margar,
>>>
>>> I guess you need to define number of points in your graph..
>>> Try to use g->Set(n);
>>> http://root.cern.ch/root/htmldoc/TGraph2DErrors.html#TGraph2DErrors:Set
>>>
>>> regards,
>>>
>>> Bakur.
>>>
>>>
>>>
>>> Margar Simonyan wrote:
>>>>
>>>> Hello ROOT team
>>>>
>>>> I don't understand why the following few lines result into ROOT crush
>>>>
>>>> root [0] TGraph2DErrors * g = new TGraph2DErrors()
>>>> root [1] g->SetNameTitle("a", "b")
>>>> root [2] g->SetPoint(0, 1.0, 1.0, 1.0)
>>>> root [3] g->SetPointError(0, 1.0, 1.0, 1.0)
>>>>
>>>> I have tested on ROOT version 5.16/00 (lxplus) and 5.20/00 (my
>>>> laptop). Any explanation ?
>>>>
>>>> Thanks,
>>>>           Margar
>>>>
>>>>
>>>> *** Break *** segmentation violation
>>>> (no debugging symbols found)
>>>> Using host libthread_db library "/lib64/tls/libthread_db.so.1".
>>>> Attaching to program: /proc/25479/exe, process 25479
>>>> (no debugging symbols found)...done.
>>>> [Thread debugging using libthread_db enabled]
>>>> [New Thread 182913018112 (LWP 25479)]
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------------------------------
>>>>  Margar Simonyan    ------     post-doctoral researcher, ATLAS
>>>>  LAPP, 9 Chemin de Bellevue, BP 110 F-74941, Annecy-le-Vieux
>>>>  Tel: +33450091785     +41227671123 (CERN)
>>>>
>>>>
>>>> -----------------------------------------------------------------------------------------------------
>>>>
>>>>
>>>
>>>
>>
>
>
Received on Tue Mar 17 2009 - 14:44:05 CET