[R] Sorting in R

[Art Salwin]

How do you sort one vector using another vector as a sort
key?  Sort of equivalent
to sorting rows of a spreadsheet using one of its columns as
key.  Here's a simple example:

name<-c("Joe","Sue","Mary")
age<-c(22, 57, 13)
zipcode<-(50854, 20617, 91234)
If we sort the name vector in zipcode order we should get
mary, joe, sue
If we sort name in age order we should get sue, joe, mary
Having secondary keys to break ties would be nice, as would
the ability to sort (in this example)
all 3 vectors at once.

Any help appreciated.
-- 
Art Salwin
salwin at mitretek.org
(202) 863-2985
(202) 863-2988 (fax)
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