Re: Create a bash-script that runs C-files in ROOT

From: Axel Naumann <Axel.Naumann_at_cern.ch>
Date: Wed, 7 Apr 2010 10:00:54 +0200


Hi Ida,

what about the following:

#include <iostream>

void myScript1(int dir) {

   TString filename = TString::Format("rootFile_%d.root", dir);    TFile* f = TFile::Open(filename);
   if (!f || f->IsZombie()) {

     std::cerr << filename << " not found!" << std::endl;
     return;

   }
   TTree* tree = 0;
   f->GetObject("finalDelayedCoinci", tree); }

With one single tree per run you don't need a TChain, and you can pass the dir number to the C++ part by invoking it with:

for (j=0;j<=$N,j++)
do

    cd folder$j
    root -q -b myScript1.C\($j\) myScript2.C     cd ..
done

Cheers, Axel.

Ida Häggström wrote on 04/07/2010 08:47 AM:
> Hi Brett and thanks for your suggestion!
> I'm really not familiar with C unfortunately and tried implementing your
> suggestion without success... =(. I do need something similar to this,
> i.e. be able to call different filenames. To be more specific:
>
> I have a bash-script with a loop ( in this case 40 loops, as many as the
> number of root files I have).
> Each loop I run:
> --------------------------------------
> for (j=0;j<=$N,j++)
> do
> cd folder$j
> root -q -b myScript1.C myScript2.C
> cd ..
> done
> --------------------------------------
> Each folder I enter contains one root file, different names however.
> Now, each loop I want to use a different root-file in the first C-script
> (rootFile_0.root to rootFile_39.root).
> I've searched around and tried this in my first C-script (myScript1.C):
> --------------------------------------
> char Root_File[250];
> void *dirp = gSystem->OpenDirectory(".");
> const char *afile;
> Int_t nfiles = 0;
>
> while(afile = gSystem->GetDirEntry(dirp)) {
> if (strstr(afile,".root")) {
> TChain chain("finalDelayedCoinci");
> sprintf(Root_File,"%s",afile);
> chain.Add(Root_File);
> printf("\n Processing file %s...\n",afile);
> nfiles++;
> }
> }
> --------------------------------------
> This seems to find the single root-file in each directory. However, I'm
> afraid this will cause some problems if I for example add another
> root-file into a folder or something. Your suggestion would be nicer, if
> I can just send the filename as an argument into the C-script, something
> like:
> --------------------------------------
> for (j=0;j<=$N,j++)
> do
> cd folder$j
> root -q -b myScript1.C("rootFile_$j") myScript2.C
> cd ..
> done
> --------------------------------------
> and then add this file to the chain inside the C-script. I've tried
> implementing this, but unfortunately I'm really not good at neither C
> nor root! I really appreciate your help,
>
> Cheers,
> Ida
>
>
> Den 6 april 2010 19.56 skrev Brett Viren <bv_at_bnl.gov <mailto:bv_at_bnl.gov>>:
>
> Ida Häggström <ida.haggstrom_at_radfys.umu.se
> <mailto:ida.haggstrom_at_radfys.umu.se>> writes:
>
> > I want to
> > create a bash-script to run from my Linux teminal that calls for
> ROOT and
> > executes the C-scripts and so on...
>
> One more feature to consider is that you can pass arguments from the
> shell into your C-scripts. You just have to be a little careful to make
> sure that any special characters are escaped so the shell won't
> interpret them.
>
> For example,
>
> shell> cat myscript.C
> void myscript(const char* filename) {
> TFile* f = new TFile(filename);
> //...
> }
>
> You can pass in the file name like:
>
> shell> root -q myscript.C\(\"file1.root\"\)
>
> or wrap the whole thing in single-quotes like:
>
> shell> root -q 'myscript.C("file1.root")'
>
>
> -Brett.
>
>
>
Received on Wed Apr 07 2010 - 10:00:59 CEST

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