Re: [ROOT] incrementing a TH2

From: Victor Perevoztchikov (perev@bnl.gov)
Date: Wed Sep 27 2000 - 02:51:31 MEST


Hi Jeff,

use:
h1.Add(&h2,1);

Victor

Jeffrey Reid wrote:
> 
> Hi All
> 
>   I am using version 2.25/01 and I want to add a bunch of 2d histograms
> together, and so I assumed that I could use something like I would for 1d
> histograms...
> 
>   TH2F h1, h2;
>   Double_t c;
>   ...
> 
>   h1.Add(h2,1);  // h1 = h1 + c*h2;
> 
> However, I find that Add isn't overloaded for TH2 and so it is expecting a
> TH1 for the first arguement of Add().  Is this a bug, am I missing
> something obvious, or does the Add() for TH2 simply not exist?  How can I
> get this 'histogram increment' functionality for 2d histograms?
> 
> Jeff
> 
> 

-- 
Victor M. Perevoztchikov   perev@bnl.gov  perev@vxcern.cern.ch       
Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000
tel office : 631-344-7894; fax 631-344-4206; home 631-345-2690



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