Root analysis
yao
Code & file
• Code:/usrX/shyao/mysql2root/r321/MySQLto
ROOT2.cc
line 25~207
• File:/sp8data11/shyao/rootfile/r321test.root
run
dimuon
track
hit
hit
track
hit
event
track
hit
hit
Spill
track
track
Event packet
$ root
root [] Tfile f(“/sp8data11/shyao/rootfile/r321test.root”)
root [] f->ls()
TFile**
r321test.root production_dimuonR321 Tree
TFile*
r321test.root production_dimuonR321 Tree
KEY: TTree r321;2 A tree with data taken from SQL, 2010/11/22
KEY: TTree r321;1 A tree with data taken from SQL, 2010/11/22
KEY: TTree event;15
title
KEY: TTree event;14
title
Root [] event->Print()
*tree :event : title
Event
*Br 0 :runID : runID/I
*Br 1 :eventID : eventID/I
*Br 2 :nDimuons : nDimuons/I
*Br 3 :mWeight : mWeight/D
*Br 4 :mProcessCode : mProcessCode[32]/C
*Br 5 :ntracks : ntracks/I
dimuon
*Br 6 :dimuonID : dimuonID/I
*Br 7 :trackID1 : trackID1/I
*Br 8 :trackID2 : trackID2/I
*Br 9 :mass : mass/D
…xxx…
track
*Br 26 :trackID : trackID[ntracks]/I
*Br 27 :x0
: x0[ntracks]/D
…xxx…
*Br 39 :ke0
: ke0[ntracks]/D
Draw
Root [] event->Draw(“event.ntracks”)
Root [] event->Draw(“event.x0”)
Root [] event->Draw(“event.x0[]”)
Root [] event->Draw(“event.x0[0]”)
Root [] event->Draw(“event.x0[0]: event.eventID”)
Root [] event->Draw(“event.x0[0]:event.eventID”,
”event.eventID<1000”)
Root [] event->Draw(“event.x0[0]:event.eventID”,
”event.eventID<1000&& event.eventID>100”)
Root [] event->Draw(“event.x0”,””,”E”)//error bar
Root [] event->Draw(“event.x0”,””,”same”)//painting on the same canvas
Root [] event->Draw(“event.x0”,””,””,1000)//entries
Scan
Root [] event->Scan()//first 8 varables
Root [] event->Scan(“*”)//all the varables
Root [] event->Scan(“var1:var2:var3”)
Root [] event->Scan(“var1:var2:var3”,”var1==0”)
Root [] event->SetScanField(0)
Root [] event->Scan(“*”); >temp
Root [] event->Scan(“ntracks:x0”);
***********************************************
* Row * Instance * ntracks *
x0 *
***********************************************
*
0*
0*
24 * -0.129800 *
*
0*
1*
24 * -0.129800 *
*
0*
2*
24 * 19.029987 *
Show
Root [] event->Show(1234)