[ROOT] fabs and abs

From: Dmitri Litvintsev (litvinse@fnal.gov)
Date: Thu Jul 25 2002 - 23:50:16 MEST 

Hi ROOTers,

Q: Why do I have this error:

	root [8] cout << fabs(-10) << endl;
	10
	root [9]    TCut cut2 = "fabs(pt3-pt2)>1.e-5"
	root [10]
	root [10]    TH1F* h = new TH1F("test",cut2.GetTitle(),100,2,3);
	root [11]    nt->Project(h->GetName(),"mmass",cut2);

	*ERROR 26 :
	 Unknown name : "fabs(pt3-pt2)"

	TMath::Abs() also does not work


I know that abs instead of fabs works. abs normally takes int
argument(at least C's abs), so I'm not sure if I can use abs.
Indeed:

root [18] cout << abs(-1.5) << endl;
1

Please advice.

P.S.:  TCut cut2 = "pt3-pt2>1.e-5||pt3-pt2<1.e-5" is not a good solution,
       too many keystrokes too many errors :(


regards,
Dmitri Litvintsev

/----------------------------------------------------------\
| Tel:       (630) 840 5005                                |
| FAX:       (630) 840 2968                                |
| office:    149-L CDF Trailers                            |
| E-mail:    litvinse@fnal.gov                             |
\----------------------------------------------------------/

This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:01 MET