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...1] FALSE Why it is FALSE. Then I tried > d<-abs(b+52) Error: object "b" not found > d<-abs(bb+52) > d [1] 53 > c==d [1] TRUE Now it is TRUE, but a wired thing is as following, > c==abs(bb+52) [1] TRUE The coding "c==abs(bb+52)" is just the same from the 3line in the top, why 2 different results? HOWEVER, it is not repeatable, I am glad I did not close the window. Also, > c<-0.5-0.1 > n<-0.6-0.2 > n==c [1] FALSE So, is "==" comparing formula or result? Thanks, Renny [[alternative HTML version deleted]]