Hi,
you should try
> root [2] TLeaf *ntrack = t1.GetLeaf("ntrack")
> root [3] TLeaf *stat = t1.GetLeaf("stat") // <-- it's "stat", not
"stat[index]"
> root [4] t1.GetEntry(50)
> (Int_t)4400
> root [5] ntrack.GetValue()
> (const Double_t)1.57000000000000000e+02
> root [6] stat.GetValue(100) // <-- you have to give the index as GetValue
param
Though I wonder why the ntrack branch in the tree Print yields
*Entries : 1000 : Total Size= 0 bytes File Size = 0 *
Cheers, Axel.
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Viatcheslav E.
> Kouznetsov
> Sent: Sunday, May 06, 2001 11:34 AM
> To: roottalk@pcroot.cern.ch
> Subject: [ROOT] Reading array elements from tree
>
>
> Hi Rooters!
> I collide with a strange problem:
> I run the tree1.C macros from the standard tutorials and
> want to read some values from the tree. Then I receive strange
> message. Below you can read my log of ROOT session
>
> root [0] TFile f("tree1.root")
> root [1] t1.Print()
> ******************************************************************
> ************
> *Tree :t1 : Reconst ntuple
> *
> *Entries : 1000 : Total = 6925775 bytes File Size =
> 4491608 *
> * : : Tree compression factor = 1.56
> *
> ******************************************************************
> ************
> *Br 0 :ntrack : ntrack/I
> *
> *Entries : 1000 : Total Size= 0 bytes File Size =
> 0 *
> *Baskets : 0 : Basket Size= 32000 bytes Compression=
> 1.00 *
> *.................................................................
> ...........*
> *Br 1 :stat : stat[ntrack]/I
> *
> *Entries : 1000 : Total Size= 971639 bytes File Size =
> 12823 *
> *Baskets : 31 : Basket Size= 32000 bytes Compression=
> 75.77 *
> *.................................................................
> ...........*
> root [2] TLeaf *ntrack = t1.GetLeaf("ntrack")
> root [3] TLeaf *stat = t1.GetLeaf("stat[100]")
> root [4] t1.GetEntry(50)
> (Int_t)4400
> root [5] ntrack.GetValue()
> (const Double_t)1.57000000000000000e+02
> root [6] stat.GetValue()
> Error: illegal pointer to class object stat 0x0 20
FILE:/tmp/fileie7IKV_cint LI
NE:1
*** Interpreter error recovered ***
How I can get the value of stat[100] with entry number 50?
Best wishes!
GloryS
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