Hi, Possibly R FAQ 7.31 vec1[180] #[1] 18 vec1[180]-18 #[1] 3.552714e-15 vec1[round(vec1,2)%in%vec2] # [1] 2 4 6 8 10 12 14 16 18 20
A.K. ----- Original Message ----- From: Finlay Scott <drfinlaysc...@gmail.com> To: r-help@r-project.org Cc: Sent: Friday, August 23, 2013 11:00 AM Subject: [R] Unexpected behaviour with seq() and %in% Hi, During the course of putting together a function I came across some unexpected behaviour when using seq() and %in%. I am creating two numeric vectors using seq(), and then using %in% to find the values in one vector that are in the other. Sometimes all the values are found, but sometimes a value is not found. It seems that the behaviour is inconsistent and I don't understand why. Below are some reproducible examples: vec1 <- seq(from = 0.1, to = 20, by = 0.1) vec2 <- seq(from = 2, to = 20, by = 2) vec1[vec1 %in% vec2] [1] 2 4 6 8 10 12 14 16 20 The value 18 is not found. Starting vec1 at 0.2: vec1 <- seq(from = 0.2, to = 20, by = 0.1) vec2 <- seq(from = 2, to = 20, by = 2) vec1[vec1 %in% vec2] [1] 2 4 8 10 12 14 16 18 20 Now the value 6 is not found. Starting vec1 at 0.5: vec1 <- seq(from = 0.5, to = 20, by = 0.1) vec2 <- seq(from = 2, to = 20, by = 2) vec1[vec1 %in% vec2] [1] 2 4 6 8 10 12 14 16 18 20 Now all the values are found. Can someone please explain what is happening? Why should the starting value of vec1 make a difference? Thanks Finlay R version info: platform x86_64-pc-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu version.string R version 3.0.1 (2013-05-16) [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
