Hi According to ROOT reference and TVector3 class definition, we can use operation(e.g +,*,.) between TVector3 objects. For example root[0] gSystem->Load("libPhysics") root[1] TVector3* vec1 = new TVector3(1,1,1) root[2] TVector3* vec2 = new TVector3(2,2,2) root[3] TVector3* vec3 = new TVector3() root[4] vec3 = vec1*vec2 But when excuting root[4], I got the message: Illegal operatior pointer 1 FILE:(tmpfile) LINE:1 Why can't I use TVector3 operations? Please tell me. Takefumi
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