I noticed et2 of j=164 and j=165 were the same. It was a length-of-array
problem, not a bug of CopyTree().
I realize CopyTree() was smarter than I am.
- Jedong
On Fri, 28 Feb 2003, Jedong Lee wrote:
> 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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