Hello, I have a problem with 'grep'
I read several lines from a file
p <- readLines(pfile,n=8)
now I have to check that a key word "JABBERWOCKY" is not in that
segment
a <- grep("JABBERWOCKY",p)
which gives a 1 if the key is in the text or 'numeric(0)
how can I test it
if(a==1) gives Ok in one case and error:missing value where logical
needed in the other.
How can I coerce 'a' to be 0 or 1?
thanks for any help.
.
H.Ghezzo
McGill University
Montreal - Canada
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On Thu, 24 Jan 2002, R. Heberto Ghezzo wrote:> Hello, I have a problem with 'grep' > I read several lines from a file > p <- readLines(pfile,n=8) > now I have to check that a key word "JABBERWOCKY" is not in that segment > > a <- grep("JABBERWOCKY",p) > which gives a 1 if the key is in the text or 'numeric(0) > how can I test itif (length(a)) a is 1 else a is numeric(0) -thomas -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On Thu, 24 Jan 2002, R. Heberto Ghezzo wrote:> Hello, I have a problem with 'grep' > I read several lines from a file > p <- readLines(pfile,n=8) > now I have to check that a key word "JABBERWOCKY" is not in that segment > > a <- grep("JABBERWOCKY",p) > which gives a 1 if the key is in the text or 'numeric(0) > how can I test it > if(a==1) gives Ok in one case and error:missing value where logical > needed in the other. > How can I coerce 'a' to be 0 or 1? > thanks for any help.You could test the length of the result, which is > 0 iff there was a match in any of the lines. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._