[ROOT] Question about accessing multiple files

From: Edward Chen (edward@SLAC.stanford.edu)
Date: Fri Sep 06 2002 - 05:40:32 MEST 

Hi - I'm trying to write a macro which will automate the following
procedure: Access histograms of the same name from multiple files.

Right now, for example, I have:

{
  TFile esigFile("plots/esigtightPlots.root");
  TFile offresFile("plots/offrestightall.root");
  esigFile.cd();
  R2Plot->Draw();
  offresFile.cd();
  R2Plot->Draw("SAME");

  //Save to postscript
}

Now - I'd like to do this with many different plots in the same file.

So I'd have a macro that would look something like this:

doThePlots(myPlotName)

or something like that.  doThePlots would encapsulate the code above, but
be general enough to account for any plot name.  I'm just not sure how to
get the histogram from some directory using its name.

How would I do this?  Thanks.

-Ed

This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:07 MET