Hello, Francois Thank you very much for your message. I have a business trip now. I'll try to check what you say as soon as possible and let you know. With my best regards, Valery -----Original Message----- From: GENTIT Francois-Xavier DAPNIA <GENTIT@DAPNIA.CEA.FR> To: 'roottalk@root.cern.ch' <roottalk@pcroot.cern.ch> Date: 22 июня 2000 г. 17:47 Subject: [ROOT] TTRAP and TGTRA > Dear authors of ROOT, > I feel uncomfortable when I compare the code of TTRAP::SetPointss() with >the one of TGTRA::SetPoints(). As I understand, a TGTRA must become a TTRAP >when the angle "twist" is set to 0. A first look at the code of the 2 >routines show that it is not the case. A second look indicates that may be >it is not wrong, because the author of TTRAP::Setpoints() look at the angle >theta from the middle in z of the shape, but the author of >TGTRA::SetPoints() look at the angle theta from the bottom of the shape. >Hence the appearance of factors 2 in the code of TGTRA::SetPoints(). > But what really worries me is the fact that in TTRAP::SetPoints() >Tan(theta) appears everywhere, and in the code of TGTRA::SetPoints() >Sin(theta) appears everywhere. > I do not see how this difference in the views of the presumably different >authors of the 2 methods could change a Tan into a Sin ? > Could a specialist of this part of ROOT have a look at it ? > Thanks very much. > > F.X. Gentit > DAPNIA/SPP CEN Saclay > tel : 01 69 08 30 38 fax : 01 69 08 64 28 > web : http://home.cern.ch/~gentit/ > >
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