Hi Rene, Indeed, there is a division by zero in my function when evaluated at the lower bound. I guess I was confused as to what ROOT did when it saved a TF1 object. Readjusting the lower bound slightly fixes everything. But this brings up another issue, though. Certainly a TF1 object is evaluated in the Draw() method. It seems inconsistent that Write() complains (as it should, I guess) and Draw() gives no warnings. Maybe Write() and Draw() decide to evaluate the function at differing sets of points? Anyway, thanks for your help. I appreciate it. -Kalen ----------------------------------------------------------------- On Wed, 21 May 2003, Rene Brun wrote: > Hi Kalen, > > What you do should work. Could you send me a copy of your function? > > When writing a TF1 referencing an interpreted or compiled function, > the function is tabulated at fNpx values in such a way that you can > always draw the function in the reading program even if the code > of the function is not available. > In your case, it looks like the function is being evaluated with a > division by 0. > > Rene Brun > > On Wed, > 21 May 2003, Kalen Martens wrote: > > > Hi again, > > > > Is it possible to save a function (a TF1 object, for example) to a .root > > file? I am having difficulties when I try: > > > > root [14] TFile f("DeltaNLR_functions.root","recreate"); > > > > root [15] TF1 *qq_mh100 = new TF1("qq_mh100", DeltaNLR_qq_1D_mh100, 350., > > 1200., 0); > > > > ...define more functions... > > > > root [26] qq_mh100 -> Write(); > > Error: operator '/' divided by zero FILE:/tmp/sxAeOo_cint LINE:17 > > *** Interpreter error recovered *** > > > > It looks like the function is being evaluated. The Draw() method works > > just fine and without any errors, but the Write() is doing something > > strange. > > > > Thanks, > > > > -Kalen > > > > ----------------------------------------------------------------- > > - Kalen Martens Ph:(416)-978-6632 - > > - Dept. of Physics - > > - University of Toronto, Toronto, Canada - > > ----------------------------------------------------------------- > > >
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