[R] Copy dataframe for another

[RMSOPS]

I'm trying to copy the results of a dataframe to another within a cycle for
but I am not able to implement the rbind, because give th

d<-Null
df<-NULL

for(r in 2: nrow(x))
    {
      val_user<-x.name[[r]]
      pos<-x.pos[[r]] -4
      age <-x.age[[r]]
      d<-data.frame(val_user,pos,)
      print(d)
      df<-rbind(df,d)
    }

someone can help me solve this

   Thanks

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