Hi Mariusz, Example: root [0] TF1 f1("f1","sin(x)",-1,1) root [1] TF1 f2("f2","cos(x)",-1,1) root [2] TF1 f3("f3","cos(0.9*x)",-1,1) root [3] TF1 f4("f4","f1*f2/f3",-1,1) root [4] f4.Draw() see also tutorial FittingDemo.C Rene Brun Mariusz Sapinski wrote: > > Hello rooters, > > I got three different TF1 functions, defined like: > > TF1 *f1=new TF1("f1","funcf1",xdown,xup,3) > TF1 *f2=new TF1("f2","funcf2",xdown,xup,6) > TF1 *f3=new TF1("f3","funcf3",xdown,xup,3) > > I'd like to plot: f1*f2/f3 > > Is there a fast way to do it? > > Regards, > > -- > Mariusz
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