noquote                 package:base                 R Documentation

Class for "no quote" Printing of Character Strings

Description:

     Print character strings without quotes.

Usage:

     noquote(obj)

     ## S3 method for class 'noquote':
     print(x, ...)

     ## S3 method for class 'noquote':
     c(..., recursive = FALSE)

Arguments:

     obj: any R object, typically a vector of 'character' strings.

       x: an object of class '"noquote"'.

     ...: further options passed to next methods, such as 'print'.

recursive: for compatibility with the generic 'c' function.

Details:

     'noquote' returns its argument as an object of class '"noquote"'. 
     There is a method for 'c()' and subscript method ('"[.noquote"')
     which ensures that the class is not lost by subsetting.  The print
     method ('print.noquote') prints character strings _without_ quotes
     ('"..."').

     These functions exist both as utilities and as an example of using
     (S3) 'class' and object orientation.

Author(s):

     Martin Maechler maechler@stat.math.ethz.ch

See Also:

     'methods', 'class', 'print'.

Examples:

     letters
     nql <- noquote(letters)
     nql
     nql[1:4] <- "oh"
     nql[1:12]

     cmp.logical <- function(log.v)
     {
       ## Purpose: compact printing of logicals
       log.v <- as.logical(log.v)
       noquote(if(length(log.v)==0)"()" else c(".","|")[1+log.v])
     }
     cmp.logical(stats::runif(20) > 0.8)

