Hi, You can do the following: ntp->Draw("(nneu>0)*neuecal[0]+(nneu>1)*neuecal[1]+(nneu>2)*neuecal[2]+(nneu>3)*neuecal[3]>>TotNeutralEnergy"); Rene Brun On Thu, 31 Jul 2003, Yiqun Wang wrote: > I wonder if there is an easy way to project a TF2 to TF1, by fixing either > x or y? I searched the ROOTtalk site and went through the document, but > could not find it. Basically, I would like to have something like, for > example: > > TF2 *f2 = new TF2("f2", "x*y/([0]**2+x**2+y**2)",-10,10,-10,10, 1); > TF1 *f1 = f2->ProjectionX("_px", -1); // i.e. y=-1.0 > > Is it easy to implement something like that? > > Yiqun Wang > >
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