[ROOT] Is this a bug in CopyTree() (3.05/00)

From: Jedong Lee (jdlee@fnal.gov)
Date: Sat Mar 01 2003 - 03:02:49 MET


Hello,

I am stripping off an ntuple with command like this: (ROOT 3.05/00)

  TTree *small = mmm.fChain->CopyTree("Et[0]>20&&Et[1]>20") 

By the way, the resulting file contains less events than I expected.
I compared the entries and found that not all the events
that pass the criteria are written to the target file.

This seems to be happening whenever the event(entry = i) passes
the cut and event(entry = i+x) also passes, and x is small number..

This is the list of variables in two files:
( j=164 and j=165 passes the cut, only j=164 survived.
  Out of j=175,177,178,179, j=175 and j=178 survived.
  Out of j=301,302, j=301 survived.)

Original file: (showing the events that passes the cut)

j 8     et1 101.701     et2 37.4808
j 10    et1 39.8504     et2 27.9597
j 28    et1 43.283      et2 37.779
j 84    et1 45.18       et2 27.6098
j 86    et1 40.8786     et2 20.0176
j 141   et1 37.3549     et2 22.055
j 158   et1 32.8841     et2 20.5765
j 164   et1 46.0031     et2 29.4996
j 165   et1 38.1034     et2 29.4996
j 175   et1 70.7513     et2 31.3695
j 177   et1 32.906      et2 31.3695
j 178   et1 32.8016     et2 24.8853
j 179   et1 22.3331     et2 24.8853
j 216   et1 151.5       et2 91.1525
j 246   et1 26.6626     et2 20.8906
j 257   et1 121.573     et2 72.1682
j 267   et1 36.5081     et2 23.0727
j 301   et1 40.4186     et2 36.0574
j 302   et1 29.8817     et2 36.0574
j 334   et1 59.1586     et2 37.6737
 .
 .
 .

Target file: (all the events in the target)

j 0     et1 101.701     et2 37.4808
j 1     et1 39.8504     et2 27.9597
j 2     et1 43.283      et2 37.779
j 3     et1 45.18       et2 27.6098
j 4     et1 40.8786     et2 20.0176
j 5     et1 37.3549     et2 22.055
j 6     et1 32.8841     et2 20.5765
j 7     et1 46.0031     et2 29.4996
j 8     et1 70.7513     et2 31.3695
j 9     et1 32.8016     et2 24.8853
j 10    et1 151.5       et2 91.1525
j 11    et1 26.6626     et2 20.8906
j 12    et1 121.573     et2 72.1682
j 13    et1 36.5081     et2 23.0727
j 14    et1 40.4186     et2 36.0574
j 15    et1 59.1586     et2 37.6737
 .
 .
 .

Best,
Jedong



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