Re: [ROOT] Question about accessing multiple files

From: Valeri Fine (fine@bnl.gov)
Date: Fri Sep 06 2002 - 05:59:48 MEST 

You need something like this :


void doThePlots(myPlotName)
{
   TObject *R2Plot = 0;
   TFile esigFile("plots/esigtightPlots.root");
   TFile offresFile("plots/offrestightall.root");

   R2Plot = esigFile->Get(myPlotName);
   R2Plot->Draw();

   R2Plot = offresFile->Get(myPlotName);
   R2Plot->Draw("SAME");
} 


----- Original Message ----- 
From: "Edward Chen" <edward@SLAC.stanford.edu>
To: <roottalk@pcroot.cern.ch>
Sent: Thursday, September 05, 2002 11:40 PM
Subject: [ROOT] Question about accessing multiple files


> 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
>

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