Full_Name: G?ran Brostr?m Version: 2.10.1 OS: Ubuntu 9.10 Submission from: (NULL) (85.11.40.53) The documentation for 'isTRUE' states that 'isTRUE(x)' is an abbreviation of 'identical(TRUE, x)', and so is true if and only if 'x' is a length-one logical vector with no attributes (not even names). But,> x <- FALSE > isTRUE(x)[1] FALSE is not true. Add, somewhere after 'logical vector, 'equal to TRUE', or 'taking the value TRUE'. Maybe 'true' should be changed to 'TRUE' as well.