substring and substr are also helpful here.
John
At 08:10 PM 11/6/2003 -0600, Marc Schwartz wrote:
On Thu, 2003-11-06 at 19:53, Ben Day wrote: > Hi all - this is a very basic question: how does one index substrings > of a character string, for example get the 2nd through 5th characters > of the string "testing", in the R language? Indexing with square > brackets seems only to work for vectors, lists, etc., and although > I've found plenty of functions for concatenating strings, running > substitutions with regexps and the like, I seem to be at a loss when > it comes to indexing or selecting substrings. > > I'm sure I'm missing something very obvious here, but I ask only after > having scoured the basic help manuals. > > I am not so subscribed to this list, so if any replies could be sent > directly to me. > > Thanks very much, > -----Ben
unlist(strsplit("testing",""))[2:5] [1] "e" "s" "t" "i"
Use strsplit() to convert the string into a list of characters, where "" is the separator.
Then use unlist() to convert the list into a vector and index the 2:5 characters.
See ?strsplit and ?unlist
HTH,
Marc Schwartz
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----------------------------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 email: [EMAIL PROTECTED] phone: 905-525-9140x23604 web: www.socsci.mcmaster.ca/jfox
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