Is a string all blanks?
On Aug 2, 2011, at 8:07 PM, John Sorkin wrote:
windows 7 R 2.12.1 Is there any easy way to determine if a sting contains nothing but blanks? I need to check a series of strings of various length. OneBlank <- " " TwoBlanks <- " " ThreeBlanks <- " " NoBlanks <- "NoBlanks" What I want would be a function such as ALLBLANKS that would return the following ALLBLANKS(OneBlank) would be true (or 1) ALLBLANKS(TwoBlanks) would be true (or 1) ALLBLANKS(ThreeBlanks) would be true (or 1) ALLBLANKS(NoBlanks) would be false (or 0)
> bvec <- c(OneBlank, TwoBlanks ,ThreeBlanks ,NoBlanks)
> grepl(" +", bvec)
[1] TRUE TRUE TRUE FALSE
David Winsemius, MD West Hartford, CT