FAQ/Ratomic72013-03-08 10:17:16localhostconverted to 1.6 markup62009-06-10 12:21:51PeterWatson52009-06-10 12:21:42PeterWatson42009-06-10 12:19:45PeterWatson32009-06-10 12:19:31PeterWatson22009-06-10 12:19:07PeterWatson12009-06-10 12:18:31PeterWatsonHow to avoid "$ operator is invalid for atomic vectors" in RUsing some versions of R (2.8 and 2.9) you sometimes get the mystifying error message "$ operator is invalid for atomic vectors" . This can happen even if the R code you are running worked in earlier versions. This may be due to inputting data as matrix data rather than a dataframe in R. You can so this conversion easily using the command as.data.frame. This advice is presented in fuller detail here.