4 messages · Liaw, Andy, Terry Mu, Rich FitzJohn +1 more
I suppose here's one way:
hasChar <- function(x, y) { length(grep(x, y)) > 0 }
hasChar("a", "abcd")
[1] TRUE
hasChar("e", "abcd")
[1] FALSE Andy
From: Terry Mu like: "a" %in% "abcd" TRUE Thanks.
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thx, that's perfect. I thought of grep(), it also can do this. I wonder if there is a document or book that explains things categorically so it's easy to look up a function.
I suppose here's one way:
hasChar <- function(x, y) { length(grep(x, y)) > 0 }
hasChar("a", "abcd")
[1] TRUE
hasChar("e", "abcd")
[1] FALSE Andy
From: Terry Mu like: "a" %in% "abcd" TRUE Thanks.
______________________________________________ R-help at 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
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Or, using the %foo%-style functions: "%charin%" <- function(x, y) regexpr(x, y) != -1
"a" %charin% "asdf"
[1] TRUE
"a" %charin% "bsdf"
[1] FALSE Cheers, Rich
I suppose here's one way:
hasChar <- function(x, y) { length(grep(x, y)) > 0 }
hasChar("a", "abcd")
[1] TRUE
hasChar("e", "abcd")
[1] FALSE Andy
From: Terry Mu like: "a" %in% "abcd" TRUE Thanks.
______________________________________________ R-help at 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
______________________________________________ R-help at 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
On Sat, 2 Apr 2005 23:00:43 -0500, Terry Mu <muster at gmail.com> wrote :
thx, that's perfect. I thought of grep(), it also can do this. I wonder if there is a document or book that explains things categorically so it's easy to look up a function.
The HTML help does this: try help.start(), and look at "search engine and keywords". help.search() also has a keyword argument, but you need to know the keywords to know what to look for. ?help.search shows you how to find them. Duncan Murdoch