Rene Brun
Andy Haas wrote:
>
> TTree::Draw() seems to be doing funny things with decimal points in
> its arguments, i.e. tree->Draw("e","e<.5") or tree->Draw("e","e>1.09");
>
> Under NT 4.0 SP3, using the aug 28th version of 2.00/11, the following
> macro produces erroneous results. It generates the numbers
> 0,0.1,0.2,0.3, ... , 1000 and then selects them based on criteria.
> Whenever a decimal point is involved in the criteria, the results are
> wrong. For instance, it picks 10 numbers in the list less than .25,
> where there are obviously only 3!
> /////////////////////////////////////////////////////////////////////////
> {
> gROOT->Reset();
>
> t = new TTree("t","testtree");
> typedef struct {Float_t e;} energy;
> energy m_energy;
> t->Branch("energy",&m_energy,"e/F");
>
> for (int i = 0; i<10000; i++) {
> m_energy.e = i/10;
> t->Fill();
> }
>
> t->Draw(">>list1","e<1000");
> list1->Print();
>
> t->Draw(">>list2","e>999.2");
> list2->Print("all");
>
> t->Draw(">>list3","e<100");
> list3->Print();
>
> t->Draw(">>list4","e<10.24");
> list4->Print("all");
>
> t->Draw(">>list17","e<10");
> list17->Print("all");
>
> t->Draw(">>list5","e<1.234");
> list5->Print("all");
>
> t->Draw(">>list6","e<1");
> list6->Print("all");
>
> t->Draw(">>list7","e<.91");
> list7->Print("all");
>
> t->Draw(">>list8","e<.25");
> list8->Print("all");
>
> t->Draw(">>list9","e<.1");
> list9->Print("all");
>
> t->Draw(">>list10","e<.01");
> list10->Print("all");
>
> t->Draw(">>list11","e<.003");
> list11->Print("all");
>
> t->Draw(">>list12","e<.0021");
> list12->Print("all");
>
> t->Draw(">>list13","e<.0001");
> list13->Print("all");
>
> t->Draw(">>list14","e<.00001");
> list14->Print("all");
>
> t->Draw(">>list150","e<0.000001");
> list150->Print("all");
>
> t->Draw(">>list151","e < 0.000001");
> list151->Print("all");
>
> t->Draw(">>list152","e < .000001");
> list152->Print("all");
>
> t->Draw(">>list153","e< .000001");
> list153->Print("all");
>
> t->Draw(">>list154","e< 0.000001");
> list154->Print("all");
>
> t->Draw(">>list155","e<0.000001");
> list155->Print("all");
>
> t->Draw(">>list16","e<0.00000001");
> t->Draw("e","e<0.0000000001");
> list16->Print("all");
>
> }
>
> the current keyboard layout is 437
> *******************************************
> * *
> * W E L C O M E to R O O T *
> * *
> * Version 2.00/11 28 August 1998 *
> * *
> * You are welcome to visit our Web site *
> * http://root.cern.ch *
> * *
> *******************************************
>
> CINT/ROOT C/C++ Interpreter version 5.13.69, Aug 22 1998
> Type ? for help. Commands must be C++ statements.
> Enclose multiple statements between { }.
> root [0] .x haas/listtest.c
> EventList:list1/e<1000, number of entries =10000, size=10000
> EventList:list2/e>999.2, number of entries =0, size=1000
> EventList:list3/e<100, number of entries =1000, size=1000
> EventList:list4/e<10.24, number of entries =110, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> 10 10 11 12 13 14 15 16 17
> 18 1
> 20 20 21 22 23 24 25 26 27
> 28 2
> 30 30 31 32 33 34 35 36 37
> 38 3
> 40 40 41 42 43 44 45 46 47
> 48 4
> 50 50 51 52 53 54 55 56 57
> 58 5
> 60 60 61 62 63 64 65 66 67
> 68 6
> 70 70 71 72 73 74 75 76 77
> 78 7
> 80 80 81 82 83 84 85 86 87
> 88 8
> 90 90 91 92 93 94 95 96 97
> 98 9
> 100 100 101 102 103 104 105 106 107
> 108 1
> EventList:list17/e<10, number of entries =100, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> 10 10 11 12 13 14 15 16 17
> 18 1
> 20 20 21 22 23 24 25 26 27
> 28 2
> 30 30 31 32 33 34 35 36 37
> 38 3
> 40 40 41 42 43 44 45 46 47
> 48 4
> 50 50 51 52 53 54 55 56 57
> 58 5
> 60 60 61 62 63 64 65 66 67
> 68 6
> 70 70 71 72 73 74 75 76 77
> 78 7
> 80 80 81 82 83 84 85 86 87
> 88 8
> 90 90 91 92 93 94 95 96 97
> 98 9
> EventList:list5/e<1.234, number of entries =20, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> 10 10 11 12 13 14 15 16 17
> 18 1
> EventList:list6/e<1, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list7/e<.91, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list8/e<.25, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list9/e<.1, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list10/e<.01, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list11/e<.003, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list12/e<.0021, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list13/e<.0001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list14/e<.00001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list150/e<0.000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list151/e < 0.000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list152/e < .000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list153/e< .000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list154/e< 0.000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> EventList:list155/e<0.000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> Warning in <MakeDefCanvas>: creating a default canvas with name c1
> EventList:list16/e<0.00000001, number of entries =10, size=1000
> 0 0 1 2 3 4 5 6 7
> 8 9
> root [1]
> //////////////////////////////////////////////////////////////////////
>
> There can' be any less than .0001 !!!
>
> Cheers,
> Andy.
>
> ==
> Andrew Haas - haas@yahoo.com
> University of Washingon Physics
> Glast - D0
>
> _________________________________________________________
> DO YOU YAHOO!?
> Get your free @yahoo.com address at http://mail.yahoo.com