[R] simple q: returning a logical vector of substring matches
I'm a relative R novice, and sometimes the simple things trip me up. Suppose I have a - c(apple, pear) and I want a logical vector of whether each of these strings contains ear (in this case, F T). What is the idiom? Quizzically, Mark Lindeman __ 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.
Re: [R] simple q: returning a logical vector of substring matches
You can try the following: a == grep(ear, a, value=T) -Christos Christos Hatzis, Ph.D. Nuvera Biosciences, Inc. 400 West Cummings Park Suite 5350 Woburn, MA 01801 Tel: 781-938-3830 www.nuverabio.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Saturday, January 20, 2007 1:31 PM To: r-help@stat.math.ethz.ch Subject: [R] simple q: returning a logical vector of substring matches I'm a relative R novice, and sometimes the simple things trip me up. Suppose I have a - c(apple, pear) and I want a logical vector of whether each of these strings contains ear (in this case, F T). What is the idiom? Quizzically, Mark Lindeman __ 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.
Re: [R] simple q: returning a logical vector of substring matches
On Sat, 2007-01-20 at 13:30 -0500, [EMAIL PROTECTED] wrote: I'm a relative R novice, and sometimes the simple things trip me up. Suppose I have a - c(apple, pear) and I want a logical vector of whether each of these strings contains ear (in this case, F T). What is the idiom? Quizzically, Mark Lindeman See ?grep and ?regexp a - c(apple, pear) grep(ear, a) [1] 2 grep(ear, a, value = TRUE) [1] pear If you actually want the answer to be FALSE TRUE, then: a %in% grep(ear, a, value = TRUE) [1] FALSE TRUE In that case see ?%in% HTH, Marc Schwartz __ 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.
Re: [R] simple q: returning a logical vector of substring matches
try 'regexpr'
a - c(apple, pear)
regexpr('ear',a)!=-1
[1] FALSE TRUE
On 1/20/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
I'm a relative R novice, and sometimes the simple things trip me up.
Suppose I have
a - c(apple, pear)
and I want a logical vector of whether each of these strings contains
ear (in this case, F T). What is the idiom?
Quizzically,
Mark Lindeman
__
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.
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem you are trying to solve?
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] simple q: returning a logical vector of substring matches
Using the builtin month.abb try this: regexpr(ov, month.abb) 0 Although not needed here, if ov were a character string that could have special characters such as . and * that have special meaning in a regular expression then do this to prevent such interpretation: regexpr(ov, month.abb, fixed = TRUE) 0 See ?regexpr On 1/20/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I'm a relative R novice, and sometimes the simple things trip me up. Suppose I have a - c(apple, pear) and I want a logical vector of whether each of these strings contains ear (in this case, F T). What is the idiom? Quizzically, Mark Lindeman __ 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.
