Dictionaries and pairs

Question

In R I was wondering if I could have a dictionary (in a sense like python) where I have a pair (i, j) as the key with a corresponding integer value. I have not

Answer 1

You can just use a data.frame:

a = data.frame(spam = c("alpha", "gamma", "beta"), 
               shrub = c("primus","inter","parus"),
               stringsAsFactors = FALSE)
rownames(a) = c("John", "Eli","Seth")
> a
      spam  shrub
John alpha primus
Eli  gamma  inter
Seth  beta  parus

>     a["John", "spam"]
[1] "alpha"

This handles the case with a 2d dictionary style object with named keys. The keys can also be integers, although they might have to be characters in stead of numeric's.