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
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