Hi Sebastien, I can run your simple example without problems using the PRO version 3.03/09. I believe that the ouput is correct. See the result of TTree::Print below. I suggest to try with version 3.03/09 and let me know. Rene Brun root [0] TFile f("out.root") root [1] .ls TFile** out.root TFile* out.root KEY: TTree Global;1 Global root [2] Global.Print() ****************************************************************************** *Tree :Global : Global * *Entries : 13 : Total = 126477 bytes File Size = 66252 * * : : Tree compression factor = 1.37 * ****************************************************************************** *Br 0 :GTRACK : ngtrk/I:chi_2[ngtrk]/F:dca0[ngtrk]/F:dca1[ngtrk]/F: * * | dcaerr0[ngtrk]/F:dcaerr1[ngtrk]/F:dedx[ngtrk]/F:dphidir[ngtrk]/F:* * | dpq[ngtrk]/F:dpt[ngtrk]/F:dqoverpt[ngtrk]/F:drmin[ngtrk]/F: * * | drp[ngtrk]/F:drq[ngtrk]/F:drsig[ngtrk]/F:drt[ngtrk]/F: * * | drz[ngtrk]/F:dtanl[ngtrk]/F:dtq[ngtrk]/F:dzca[ngtrk]/F: * * | dzp[ngtrk]/F:dzq[ngtrk]/F:dzt[ngtrk]/F:ededx[ngtrk]/F: * * | gtindex[ngtrk]/I:mcidx[ngtrk]/I:ncft[ngtrk]/I:nsmt[ngtrk]/I: * * | phidir[ngtrk]/F:qoverpt[ngtrk]/F:rc[ngtrk]/F:rsig[ngtrk]/F: * * | tanl[ngtrk]/F:tanth[ngtrk]/F:xc[ngtrk]/F:yc[ngtrk]/F:zc[ngtrk]/F:* * | zca[ngtrk]/F * *Entries : 13 : Total Size= 54697 bytes File Size = 26962 * *Baskets : 1 : Basket Size= 32000 bytes Compression= 1.20 * *............................................................................* *Br 1 :Gtr401atDCA : ntrk401DCA/I:chsq[ntrk401DCA]/F:cid/I: * * | err00[ntrk401DCA]/F:err10[ntrk401DCA]/F:err11[ntrk401DCA]/F: * * | err20[ntrk401DCA]/F:err21[ntrk401DCA]/F:err22[ntrk401DCA]/F: * * | err30[ntrk401DCA]/F:err31[ntrk401DCA]/F:err32[ntrk401DCA]/F: * * | err33[ntrk401DCA]/F:err40[ntrk401DCA]/F:err41[ntrk401DCA]/F: * * | err42[ntrk401DCA]/F:err43[ntrk401DCA]/F:err44[ntrk401DCA]/F: * * | hmaskw1[ntrk401DCA]/I:hmaskw2[ntrk401DCA]/I: * * | hmaskw3[ntrk401DCA]/I:nhit[ntrk401DCA]/I:nmeas[ntrk401DCA]/I: * * | par0[ntrk401DCA]/F:par1[ntrk401DCA]/F:par2[ntrk401DCA]/F: * * | par3[ntrk401DCA]/F:par4[ntrk401DCA]/F:parsrf/F * *Entries : 13 : Total Size= 71262 bytes File Size = 18746 * *Baskets : 1 : Basket Size= 32000 bytes Compression= 1.61 * *............................................................................* On Thu, 3 Oct 2002, Sebastien Greder wrote: > Hi Rooters, > > I'm encountering some problems while copying a tree. > I put an examplein : > > /afs/in2p3.fr/home/g/greder/public/testnew.tar.gz > > To sum up , I want to do som selection on events in a tree. > Also I want to remove some branches I don't use. > I wrote a small macro to do this but there's a problem when copying one > branch : Gtr401atDCA, it's completely empty in the output except for one > variable ntrk401DCA. All the other branches are correctly copyed. > > I don't know if it's a branch pb, I don't think my code does something > wrong since the other branches are ok, but I don't know how to check the > branch "state" > > sebastien. > > pd : to use the prog : > > root > .L teststream.C > main("out.root") ==> output file. > > I'm running on RH 6.4 with version 03.02.07 compiled with gcc 2.91 > > > >
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