Hi Valeri,
As you correctly report, TTree::Scan prints only one entry in case
of variable length arrays. The problem for a general implementation is
when the same entry contains different arrays with different loop
indices.
I think that using TTree::Show is better in this case.
Rene Brun
Tioukov Valeri wrote:
>
> Hi rooters,
>
> The output of Scan() function seems to be misleading in case of
> TClonesArray branch, especially then array could have 0 size.
>
> To demonstrate it I modify in MainEvent.cxx one line:
>
> // Int_t ntrack = Int_t(arg5 +arg5*sigmat/120.);
> Int_t ntrack = ev;
>
> In this case the first event has 0 tracks.
>
> After producing Event.root start the macro :
>
> zero.C
> {
> gSystem.Load("libEvent");
>
> TFile f("Event.root");
>
> for(int i=0; i<3; i++)
> T->Scan("fTemperature:fFlag:fNtrack:fPx:fPy","","",i+1);
> }
>
> The output is:
> root [0] .x zero.C
> ************************************************************************
> * Row *fTemperature * fFlag * fNtrack * fPx * fPy *
> ************************************************************************
> * 0 * 20.319 * 0 * 0 * 0 * 0 *
> ************************************************************************
> ************************************************************************
> * Row *fTemperature * fFlag * fNtrack * fPx * fPy *
> ************************************************************************
> * 0 * 20.319 * 0 * 0 * 0 * 0 *
> * 1 * 20.041 * 0 * 1 * -0.52418 * 1.8685 *
> ************************************************************************
> ************************************************************************
> * Row *fTemperature * fFlag * fNtrack * fPx * fPy *
> ************************************************************************
> * 0 * 20.319 * 0 * 0 * -0.52418 * 1.8685 *
> * 1 * 20.041 * 0 * 1 * -0.52418 * 1.8685 *
> * 2 * 20.297 * 0 * 2 * 0.26634 * 0.052835 *
> ************************************************************************
>
> First question: fPx and fPy variables are printed only for 1-st track.
> How to print them for all tracks?
>
> Second question: for the 1-st event (0-entry) fPx and fPy do not
> defined because this event have no tracks, but there printed !?
>
> I paw the output of nt/scan is exactly as the expected - nothin
> printed in case of 0 tracks, everithing - in case of many tracks:
>
> nt/scan 7100 ! ! ! ! idev ntr day daz
> +-------+-------------+-------------+--------------+--------------+
> | Event | idev | ntr | day | daz |
> +-------+-------------+-------------+--------------+--------------+
> | 403 | 4116 | 0 | | |
> | 404 | 4172 | 0 | | |
> | 405 | 65 | 1 | 0.004 | -0.002 |
> | 406 | 66 | 1 | 0.001 | -0.002 |
> | 407 | 69 | 1 | 0.002 | 0.003 |
> ....
> | 535 | 366 | 2 | | |
> | * 1 | | | 0. | -0.025 |
> | * 2 | | | -0.01 | -0.001 |
> | 536 | 423 | 2 | | |
> | * 1 | | | 0.021 | 0.009 |
> | * 2 | | | 0.009 | -0.009 |
>
> Regards
> Valeri
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