I've received a couple of responses telling me to use list (I was trying to use 2 equal length vectors but having an issue pulling out the index subscript).
I can use lists now, and stop thrashing.... :) Thx again for the assistance! -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Douglas Bates Sent: Monday, June 09, 2008 1:08 PM To: Dumblauskas, Jerry Cc: r-help@r-project.org Subject: Re: [R] Basic Question on Keys/Values On Mon, Jun 9, 2008 at 12:55 PM, Dumblauskas, Jerry <[EMAIL PROTECTED]> wrote: > As a java programmer, I'm having issue conceptualizing the following > use > case: > Given an value, passed into a function, how do I pull out the lookup? > Ie. > A list of keys (key1, key2, key3) > A list of values (val1,val2,val3) > I want to write a function (or is there something built in?) such that > Callit <- (thekey) { > (magic happens here) > Return value > } If the keys are text strings then you can use a named list as the container. > foo <- list(a = 1:10, b = LETTERS[1:3], ttt = Formaldehyde) foo$b [1] "A" "B" "C" > bar <- "a" > foo$bar NULL > foo[[bar]] [1] 1 2 3 4 5 6 7 8 9 10 Note that the $ operator is an extractor for an explicit name. If you want the value corresponding to a key which is itself stored as an object in R you must use the '[[' notation. Lists are suitable for a small to moderate number of key/value pairs. For large numbers of key/value pairs you may want to consider environments instead. > Any ideas? > > Thanks a bunch! > > ====================================================================== > ======== Please access the attached hyperlink for an important > electronic communications disclaimer: > > http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html > ====================================================================== > ======== > > ______________________________________________ > 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. > ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ============================================================================== ______________________________________________ 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.
