If you are using grep then I think you have it right. Note that "this" %in% trg
is also available. On 26 Jul 2006 11:16:25 -0400, Allen S. Rout <[EMAIL PROTECTED]> wrote: > > > > Greetings, all. > > I'm fiddling with some text manipulation in R, and I've found > something which feels counterintuitive to my PERL-trained senses; I'm > hoping that I can glean new R intuition about the situation. > > Here's an example, as concise as I could make it. > > > trg<-c("this","that") > > # these two work as I'd expected. > if ( grep("this",trg) ) { cat("Y\n") } else { cat("N\n") } > if ( grep("that",trg) ) { cat("Y\n") } else { cat("N\n") } > > # These all fail with error 'argument is of length zero' > # if ( grep("other",trg) ) { cat("Y\n") } else { cat("N\n") } > # if ( grep("other",trg) == TRUE) { cat("Y\n") } else { cat("N\n") } > # if ( grep("other",trg) == 1) { cat("Y\n") } else { cat("N\n") } > > > # This says that the result is a numeric zero. Shouldn't I be able > # to "if" on that, or at least compare it with a number? > grep("other", trg) > > # I eventually decided this worked, but felt odd to me. > if ( any(grep("other",trg))) { cat("Y\n") } else { cat("N\n") } > > > So, is the 'Wrap it in an any()' just normal R practice, and I'm too > new to know it? Is there a more fundamental dumb move I'm making? > > > > > - Allen S. Rout > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.