[ROOT] scale before fit

From: Dong Zhou (nosarthur@yahoo.com.cn)
Date: Sat Sep 20 2003 - 18:29:26 MEST 

dear ROOTers:
 
in the html document, i find that 
 
 IMPORTANT NOTE: If you intend to use the errors of this histogram later, you should call Sumw2 before making this operation.
 This is particularly important if you fit the histogram after TH1::Scale
 
now, i have to scale the histogram before fit it to a function, what shouldl i do? just call Sumw2( ) before Fit( )? 
like    h1->Scale(....);
         h1->Sumw2( );
         h1->Fit(.....);
?
 
Thank u for ur help.
 
Zhou, Dong
 



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