df_test2<-data.frame(test1=c("in","out"),
                     test2=c(1:2))

> df_test2
  test1 test2
1    in     1
2   out     2

for (i in df_test2$test1){
  for (j in df_test2$test2){
    if(i="in"){
      print(j+1)
    }else{
      print(j-1)
    }
  }

I ran the above code and nothing returned while I was expecting see the outcome being 2 and 1. Mind telling if I am using the wrong loop technique? Many thanks.