Hi,
I want to use a character as below in R,
as.character("`X^`R\`S")
[1] "`X^`R`S"
Warning messages:
1: '\`' is an unrecognized escape in a character string
2: unrecognized escape removed from "`X^`R\`S"
But I found errors.
Can I use some option in as.character() to change this?
Thanks
Mary
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Please read R FAQ 7.37. You need to escape the backslash:> z<- as.character("`X^`R\\`S") > z[1] "`X^`R\\`S"> cat(z)`X^`R\`S Bert Gunter Genentech Nonclinical Statistics -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of mary guo Sent: Friday, January 29, 2010 1:58 PM To: r-help at r-project.org Subject: [R] How to use escape characters in a string Hi, I want to use a character as below in R, as.character("`X^`R\`S") [1] "`X^`R`S" Warning messages: 1: '\`' is an unrecognized escape in a character string 2: unrecognized escape removed from "`X^`R\`S" But I found errors. Can I use some option in as.character() to change this? Thanks Mary [[alternative HTML version deleted]] ______________________________________________ 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.
On Jan 29, 2010, at 4:58 PM, mary guo wrote:> Hi, > I want to use a character as below in R,What character?> > as.character("`X^`R\`S") > [1] "`X^`R`S" > Warning messages: > 1: '\`' is an unrecognized escape in a character string > 2: unrecognized escape removed from "`X^`R\`S"> nchar("`X^`R\`S") [1] 7 Warning messages: 1: '\`' is an unrecognized escape in a character string 2: unrecognized escape removed from "`X^`R\`S" > substr("`X^`R\`S" , 7,7) [1] "S" Warning messages: 1: '\`' is an unrecognized escape in a character string 2: unrecognized escape removed from "`X^`R\`S" > substr("`X^`R\`S" , 6,6) [1] "`" Warning messages: 1: '\`' is an unrecognized escape in a character string 2: unrecognized escape removed from "`X^`R\`S" > substr("`X^`R\`S" , 5,5) [1] "R"> > But I found errors. > Can I use some option in as.character() to change this?What do you want? Just to add a back-slash? > nchar("`X^`R\\`S") [1] 8 > substr("`X^`R\\`S" , 6,6) [1] "\\" Notice that one of the backslashes is not counted because it is not present in the internal representation. It is, however, printed with doubling. -- David Winsemius, MD Heritage Laboratories West Hartford, CT