Hi, I like to fit a function of two values f(x,y) with 3 parameters to datapoints of x1, y1, f1 x2, y2, f2 .... I tried the ntuple-class, and TF2 for the usersupplied function, but seem not to get the desired result. Basically I'm lost... Has anyone solved this rather simple problem ? Thanks, Markus. -- --------------------------------------------------------------------- Markus Weiss "Ah elbereth glithoniel BESSY-2 Projektteam silvren penna miriel" e-mail: weiss@abbe.exp.bessy.de phone: +49-30-6392-2941 ---------------------------------------------------------------------
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