Re: [ROOT] uncertain file order after TChain::Add("<regular expression>")

From: zaldy (zaldy@neutrino.kek.jp)
Date: Wed Aug 20 2003 - 15:36:55 MEST 

Dear Rene,

This is a similat observation I have with TChain.

For exmaple I have 179 file I have. Using a Tree->MakeClass("...");
I will have the list of the chained root files. However, I have problems 
with arrangement especially if the files are taken in order and time 
element is important.

In my case TChain list files like this.


file001A01.root
file001A02.root
....
file001A09.root
file001A100.root
file001A101.root
...............
file001A109.root
file001A10.root
file001A101.root
file001A102.root
................
...............
file001A109.root
file001A10.root
file001A110.root
file001A111.root
...............
file001A119.root
file001A11.root
..............
..............

In my Application, the reverse ordering is critical because this will also 
reverse the time information in the root file.

My solution now is to edit the myClass.h and re-arrange the ordering; 

Is there a command in root to correcc the ordering or how do we correct 
this?


Thank you.

PS. root 3.05/05 gcc 3.2.2 RedHat 9.0



> Hi Maksim,
> 
> Thanks for this remark.
> I have modified TChain::Add in CVS to sort the files in alphanumeric order
> in case a regular expression is used in the argument.
> 
> Rene Brun
> 
> "Maksim A. Nikulin" wrote:
> > 
> > Hi,
> > 
> > Firstly, mandatory info: root-3.05.07 gcc2.95.2 RedHat-7.3 binary
> > installation.
> > 
> > I noticed that file order in a chain after
> > Int_t TChain::Add(const char *name, Int_t nentries)
> > is depends on file creation sequence, if I use a regular expression.
> > I think the file file1.root should be before file2.root when
> > chain->Add("file[1-2].root") is used.
> > 
> > If chain1 have a friend chain2 then inappropriate file order in any
> > chain leads to wrong entry accordance.
> > 
> > See the script wrong_order in the attachment. Four files
> > tree1.root, tree2.root, friend2.root, friend1.root are created and
> > merged. I get
> > <session>
> > $ root wrong_order.C
> > <skip />
> > ************************************
> > *    Row   *       var * friend_va *
> > ************************************
> > *        0 *         1 *         2 *
> > *        1 *         2 *         1 *
> > ************************************
> > </session>
> > 
> > I expect
> > <expected>
> > ************************************
> > *    Row   *       var * friend_va *
> > ************************************
> > *        0 *         1 *         1 *
> > *        1 *         2 *         2 *
> > ************************************
> > </expected>
> > 
> > I think this effect takes place because of simple loop other directory
> > without sorting in the
> > Int_t TChain::Add(const char *name, Int_t nentries)
> > implementation.
> > 
> > Best regards,
> > Maksim Nikulin
> > 
> >   --------------------------------------------------------------------------------
> >                     Name: wrong_order.C
> >    wrong_order.C    Type: Plain Text (text/plain)
> >                 Encoding: 7bit
> 

-- 

--------------------------------------------------------
                   Zaldy A. Nawang 
                   PS Users Room 2
                   Yon Gokan, 
                   E362, Neutrino Group, 
                   IPNS, KEK, 
                   Japan 
                    
                   e-mail: zaldy@neutrino.kek.jp
                   Tel. No. : (81) 029864 - 5387
--------------------------------------------------------

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