Hi Franck, Thanks for reporting this interesting problem and the example. This was a problem in TGraph::Fit when computing the initial values for the parameters in case one fits in a sub-range of a graph. I have fixed the problem in my development version 2.23/09. Rene Brun LAVAUD FRANCK wrote: > > Hello, > > I have a problem with FIT. I have written a very simple program > to show you my problem: I considere 3 points: (x1,y1) (x2,y2) (x3,y3), > and I fit with the 'pol1' on the interval x1 to x2 and with a other 'pol1' > on the interval x2 to x3. In fact, It is very easy to find the solution > (y=ax+b, then a=(y2-y1)/(x2-x1) and b=y2-a*x2=y1-a*x1) but Root don't > arrive to find the good solution! I don't understand why it is a problem. > It is may be a problem in my program but, if it is this case, I don't > know where! > > Thank you by advance, > > Franck Lavaud > > NB: I use root 2.23 > > ----------------------------------------------------------------------- > > LAVAUD FRANCK > > Institut de Physique Nucleaire - Bat. 102 > Universite de Paris-Sud > F91406 ORSAY Cedex > > Tel.: (33) 01.69.15.72.43 E-Mail: Lavaud@ipno.in2p3.fr > Lavaud@in2p3.fr > > ----------------------------------------------------------------------- > > ------------------------------------------------------------------------ > > Name: incl.incl > incl.incl Type: Plain Text (TEXT/PLAIN) > Encoding: BASE64 > > Name: Makefile > Makefile Type: Plain Text (TEXT/PLAIN) > Encoding: BASE64 > > Name: toto.cxx > toto.cxx Type: Plain Text (TEXT/PLAIN) > Encoding: BASE64
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