RE: [ROOT] aceess to array elements from TObject

From: Elena Vataga (vataga@fnal.gov)
Date: Thu Apr 18 2002 - 15:08:33 MEST


Hello!

Thanks a lot for your reply!

I took CVS version and MakeClass produced correct code:

   Int_t           MUO_nt0[kMaxMUO];   //[MUO_]
   Int_t           MUO_nt1[kMaxMUO];   //[MUO_]
   Int_t          *MUO_mT0[kMaxMUO];   //[MUO_nt0]
   Int_t          *MUO_mT1[kMaxMUO];   //[MUO_nt1]
   Int_t          *MUO_C0[kMaxMUO];   //[MUO_nt0]
   Int_t          *MUO_C1[kMaxMUO];   //[MUO_nt1]
   Float_t        *MUO_T0[kMaxMUO];   //[MUO_nt0]
   Float_t        *MUO_T1[kMaxMUO];   //[MUO_nt1]

But:

1. TBrowser not able to manipulate this arrays any more
  ( with older version it was fine)

2. I still do not understand how to access array elements in tree->Draw:

*Br   76 :MUO.T0    : T0[MUO_]                                               *
*Entries :     6971 : Total  Size=      49626 bytes  File Size  =      18920 *
*Baskets :        1 : Basket Size=      64000 bytes  Compression=   2.62     *
*............................................................................*

tree->Draw("MUO.T0[0]") -> draws all T0 for the first muon, but if I need
to compare first and second elements in array?


	Will be grateful for your reply,
				regards,
					Elena


On Wed, 17 Apr 2002, Philippe Canal wrote:

> Hi,
>
> ( In our usual pre-planning :) ), this has been fixed 5 days ago
> and the fix is available in the head of the CVS repository.
>
> The problem was that MakeClass was not creating the correct code
> in the case of a TClonesArray containing object of a class that has
> variable size array.  As you pointed out it should have had a '*' in
> the date member definition.  However this is not sufficient since the
> reading part also needed to be fixed.
>
> Cheers,
> Philippe.
>
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Elena Vataga
> Sent: Wednesday, April 17, 2002 7:23 AM
> To: Rene Brun
> Cc: roottalk@pcroot.cern.ch
> Subject: [ROOT] aceess to array elements from TObject
>
>
>
>
> 	Hello rooters!
>
>
> I used the following arrays in my TObject:
>
> class TCMXmuon: public TObject {
>
> protected:
> //---------------------------------------------------------------
> //  data members
> //---------------------------------------------------------------
>   TLorentzVector  lvec;
>
>   Int_t           DetCode;     // (1)CMU (2)CMP (3)CMU+CMP (4)CMX (5)BMU
> ....
>
>   Int_t           nt0;          // number of  inner times
>
>   Int_t*          mT0;          //[nt0]  Mean Time in inner layer
>   Int_t*          C0;           //[nt0]  Counter in inner layer
>   Float_t*        T0;           //[nt0]   Time in inner layer
>
> ...
>   Int_t           nt1;          // number of  outer times
>   Float_t*        T1;           //[nt1]   Time in outer layer
>
>
> My question is: how can I access first, second etc member of
> my array variables (T0[0], T0[1] etc) inside root - they look like flat
> numbers and not array?
>
> *............................................................................*
> *Br   70 :MUO.nt0   : nt0[MUO_]                                              *
> *Entries :     4971 : Total  Size=      47305 bytes  File Size  =      12009 *
> *Baskets :        1 : Basket Size=      64000 bytes  Compression=   3.94     *
> *............................................................................*
> *Br   71 :MUO.nt1   : nt1[MUO_]                                              *
> *Entries :     4971 : Total  Size=      47305 bytes  File Size  =      11753 *
> *Baskets :        1 : Basket Size=      64000 bytes  Compression=   4.02     *
> *............................................................................*
> *Br   72 :MUO.mT0   : mT0[MUO_]                                              *
> *Entries :     4971 : Total  Size=      49127 bytes  File Size  =      13721 *
> *Baskets :        1 : Basket Size=      64000 bytes  Compression=   3.58     *
> *............................................................................*
> *Br   73 :MUO.mT1   : mT1[MUO_]                                              *
> *Entries :     4971 : Total  Size=      48567 bytes  File Size  =      13918 *
> *Baskets :        1 : Basket Size=      64000 bytes  Compression=   3.49     *
> *............................................................................*
> *Br   74 :MUO.C0    : C0[MUO_]                                               *
> *Entries :     4971 : Total  Size=      49126 bytes  File Size  =      18567 *
> *Baskets :        1 : Basket Size=      64000 bytes  Compression=   2.65     *
> *............................................................................*
>
>
>
> I tried to MakeClass from my tree and I am getting in the header:
>    Int_t           MUO_nt0[kMaxMUO];   //[MUO_]
>    Int_t           MUO_nt1[kMaxMUO];   //[MUO_]
>    Int_t           MUO_mT0[kMaxMUO];   //[MUO_]
>    Int_t           MUO_mT1[kMaxMUO];   //[MUO_]
>    Int_t           MUO_C0[kMaxMUO];   //[MUO_]
>    Int_t           MUO_C1[kMaxMUO];   //[MUO_]
>    Float_t         MUO_T0[kMaxMUO];   //[MUO_]
>    Float_t         MUO_T1[kMaxMUO];   //[MUO_]
>
> so it is not an array?
>
>
> 	Will be most grateful for any advice,
> 					regards,
> 						Elena
>
>



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