[ROOT] TTree::CopyEntries does not copy entries

From: Frank Winklmeier (frank.winklmeier@colostate.edu)
Date: Wed Apr 28 2004 - 19:19:46 MEST


Hi,

I am trying to copy a bunch of entries from one TTree to another tree. The 
two trees are not identical in the sense that they are cloned, but they 
are created by the same program and do have exactly the same branch 
structure. Both trees have 100 entries. I clone the first tree and then 
copy all the entries of the second tree into that cloned tree. If I look 
at the result, the tree has 200 entries as expected, but all entries from 
100-199 are just a pure copy of the last entry (row 99) from the first 
tree.

Is that problem due to the fact that the two trees are not clones of each 
other? What other way does exist to do this?

Thanks a lot,
Frank


Here is the dump of what I did:


root [0] TFile f1("tree1.root")
root [1] TFile f2("tree2.root")
root [3] TTree *t1 = (TTree*)f1.Get("xtree0")              
root [4] TTree *t2 = (TTree*)f2.Get("xtree0")
root [10] TTree *t = t1.CloneTree()
root [13] t->CopyEntries(t2)


root [27] t1.Scan("event:runNumber:m0Pi0")
************************************************
*    Row   *     event * runNumber *     m0Pi0 *
************************************************
*        0 *         9 *   2001390 * 0.1335917 *
*        1 *         9 *   2001390 * 0.1256038 *
*        2 *         9 *   2001390 * 0.1335917 *
*        3 *         9 *   2001390 * 0.1256038 *
*        4 *        23 *   2001390 * 0.1468004 *
*        5 *        23 *   2001390 * 0.1468004 *
*        6 *        51 *   2001390 * 0.1362163 *
*        7 *        51 *   2001390 * 0.1362163 *
*        8 *        51 *   2001390 * 0.1356228 *
*        9 *        51 *   2001390 * 0.1345639 *
*       10 *        51 *   2001390 * 0.1345639 *
*       11 *        51 *   2001390 * 0.1385371 *
*       12 *        51 *   2001390 * 0.1371339 *
*       13 *        51 *   2001390 * 0.1362163 *
*       14 *        51 *   2001390 * 0.1362163 *
*       15 *        51 *   2001390 * 0.1356228 *
*       16 *        51 *   2001390 * 0.1345639 *
*       17 *        51 *   2001390 * 0.1345639 *
[...]
*       87 *        57 *   2001390 * 0.1214628 *
*       88 *        57 *   2001390 * 0.1445160 *
*       89 *        57 *   2001390 * 0.1413400 *
*       90 *        57 *   2001390 * 0.1165381 *
*       91 *        57 *   2001390 * 0.1186514 *
*       92 *        57 *   2001390 * 0.1197978 *
*       93 *        57 *   2001390 * 0.1495328 *
*       94 *        57 *   2001390 * 0.1340009 *
*       95 *        57 *   2001390 * 0.1446459 *
*       96 *        57 *   2001390 * 0.1280189 *
*       97 *        57 *   2001390 * 0.1156140 *
*       98 *        57 *   2001390 * 0.1295630 *
*       99 *        57 *   2001390 * 0.1490336 *
Type <CR> to continue or q to quit ==> 
************************************************
(Int_t)100


root [28] t2.Scan("event:runNumber:m0Pi0")
************************************************
*    Row   *     event * runNumber *     m0Pi0 *
************************************************
*        0 *         1 *   3108727 * 0.1276106 *
*        1 *         1 *   3108727 * 0.1447114 *
*        2 *         1 *   3108727 * 0.1456810 *
*        3 *         1 *   3108727 * 0.1407276 *
*        4 *         1 *   3108727 * 0.1185576 *
*        5 *         1 *   3108727 * 0.1172628 *
*        6 *         1 *   3108727 * 0.1307614 *
*        7 *         1 *   3108727 * 0.1276106 *
*        8 *         1 *   3108727 * 0.1447114 *
*        9 *         1 *   3108727 * 0.1456810 *
*       10 *         1 *   3108727 * 0.1407276 *
*       11 *         1 *   3108727 * 0.1315951 *
*       12 *         1 *   3108727 * 0.1176189 *
*       13 *         1 *   3108727 * 0.1307017 *
*       14 *         1 *   3108727 * 0.1185576 *
*       15 *         1 *   3108727 * 0.1172628 *
*       16 *         1 *   3108727 * 0.1307614 *
*       17 *         1 *   3108727 * 0.1276106 *
*       18 *         1 *   3108727 * 0.1315951 *
*       19 *         1 *   3108727 * 0.1176189 *
*       20 *         1 *   3108727 * 0.1307017 *
[...]
*       88 *         3 *   3108727 * 0.1259598 *
*       89 *         3 *   3108727 * 0.1259598 *
*       90 *         3 *   3108727 * 0.1259598 *
*       91 *         3 *   3108727 * 0.1327762 *
*       92 *         3 *   3108727 * 0.1218557 *
*       93 *         3 *   3108727 * 0.1459794 *
*       94 *         3 *   3108727 * 0.1330480 *
*       95 *         3 *   3108727 * 0.1344597 *
*       96 *         3 *   3108727 * 0.1311320 *
*       97 *         3 *   3108727 * 0.1332011 *
*       98 *         3 *   3108727 * 0.1438569 *
*       99 *         3 *   3108727 * 0.1477233 *
Type <CR> to continue or q to quit ==> 
************************************************
(Int_t)100


root [31] t.Scan("event:runNumber:m0Pi0") 
************************************************
*    Row   *     event * runNumber *     m0Pi0 *
************************************************
*        0 *         9 *   2001390 * 0.1335917 *
*        1 *         9 *   2001390 * 0.1256038 *
*        2 *         9 *   2001390 * 0.1335917 *
*        3 *         9 *   2001390 * 0.1256038 *
*        4 *        23 *   2001390 * 0.1468004 *
*        5 *        23 *   2001390 * 0.1468004 *
*        6 *        51 *   2001390 * 0.1362163 *
*        7 *        51 *   2001390 * 0.1362163 *
*        8 *        51 *   2001390 * 0.1356228 *
*        9 *        51 *   2001390 * 0.1345639 *
*       10 *        51 *   2001390 * 0.1345639 *
*       11 *        51 *   2001390 * 0.1385371 *
*       12 *        51 *   2001390 * 0.1371339 *
*       13 *        51 *   2001390 * 0.1362163 *
*       14 *        51 *   2001390 * 0.1362163 *
*       15 *        51 *   2001390 * 0.1356228 *
*       16 *        51 *   2001390 * 0.1345639 *
[...]
*       95 *        57 *   2001390 * 0.1446459 *
*       96 *        57 *   2001390 * 0.1280189 *
*       97 *        57 *   2001390 * 0.1156140 *
*       98 *        57 *   2001390 * 0.1295630 *
*       99 *        57 *   2001390 * 0.1490336 *
Type <CR> to continue or q to quit ==> 
*      100 *        57 *   2001390 * 0.1490336 *
*      101 *        57 *   2001390 * 0.1490336 *
*      102 *        57 *   2001390 * 0.1490336 *
*      103 *        57 *   2001390 * 0.1490336 *
*      104 *        57 *   2001390 * 0.1490336 *
*      105 *        57 *   2001390 * 0.1490336 *
[...]
*      195 *        57 *   2001390 * 0.1490336 *
*      196 *        57 *   2001390 * 0.1490336 *
*      197 *        57 *   2001390 * 0.1490336 *
*      198 *        57 *   2001390 * 0.1490336 *
*      199 *        57 *   2001390 * 0.1490336 *
Type <CR> to continue or q to quit ==> 
************************************************
(Int_t)200



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