Dear all,
I just want to determine if the characters in a character string are the
same or not. For example,
temp <- c("aa", "aA", "ab")
How do I determine the first one have the two same ?a?, and the second and
third have the different characters? Thanks in advance.
Lisa
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Hi Lisa, Is this what you have in mind?> temp <- c("aa", "aA", "ab") > temp == temp[1][1] TRUE FALSE FALSE HTH, Jorge On Tue, Apr 26, 2011 at 2:09 PM, Lisa <> wrote:> Dear all, > > I just want to determine if the characters in a character string are the > same or not. For example, > > temp <- c("aa", "aA", "ab") > > How do I determine the first one have the two same “a”, and the second and > third have the different characters? Thanks in advance. > > Lisa > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Tell-the-difference-between-characters-tp3476130p3476130.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org 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. >[[alternative HTML version deleted]]
Hi Lisa, On Tue, Apr 26, 2011 at 2:09 PM, Lisa <lisajca at gmail.com> wrote:> Dear all, > > I just want to determine if the characters in a character string are the > same or not. For example, > > temp <- c("aa", "aA", "ab") > > How do I determine the first one have the two same ?a?, and the second and > third have the different characters? Thanks in advance.Is this what you're looking for? testchar <- function(x) { substring(x, 1, 1) == substring(x, 2, 2) }> testchar("aa")[1] TRUE> testchar("aB")[1] FALSE> > > temp <- c("aa", "aA", "ab") > > sapply(temp, testchar)aa aA ab TRUE FALSE FALSE -- Sarah Goslee http://www.functionaldiversity.org
Yes. That is what I want. Thank you very much. Lisa -- View this message in context: http://r.789695.n4.nabble.com/Tell-the-difference-between-characters-tp3476130p3476288.html Sent from the R help mailing list archive at Nabble.com.
This will handle varying length strings if you want to test for the same character:> temp <- c("aa", "aA", "ab") > x <- strsplit(temp, '') > x[[1]] [1] "a" "a" [[2]] [1] "a" "A" [[3]] [1] "a" "b"> sapply(x, function(z) all(z[1] == z))[1] TRUE FALSE FALSE>On Tue, Apr 26, 2011 at 2:09 PM, Lisa <lisajca at gmail.com> wrote:> Dear all, > > I just want to determine if the characters in a character string are the > same or not. For example, > > temp <- c("aa", "aA", "ab") > > How do I determine the first one have the two same ?a?, and the second and > third have the different characters? Thanks in advance. > > Lisa > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Tell-the-difference-between-characters-tp3476130p3476130.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at r-project.org 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 Data Munger Guru What is the problem that you are trying to solve?
Thanks a lot. Lisa -- View this message in context: http://r.789695.n4.nabble.com/Tell-the-difference-between-characters-tp3476130p3476352.html Sent from the R help mailing list archive at Nabble.com.
Try this: sapply(apply(sapply(temp, charToRaw), 2, unique), length) == 1 On Tue, Apr 26, 2011 at 3:09 PM, Lisa <lisajca at gmail.com> wrote:> Dear all, > > I just want to determine if the characters in a character string are the > same or not. For example, > > temp <- c("aa", "aA", "ab") > > How do I determine the first one have the two same ?a?, and the second and > third have the different characters? Thanks in advance. > > Lisa > > > > -- > View this message in context: http://r.789695.n4.nabble.com/Tell-the-difference-between-characters-tp3476130p3476130.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at r-project.org 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. >-- Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O