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Coming from Python, the absence of a real dictionary in R has annoyed me for quite some time. Now, I actually needed to use vectors as keys in R:Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
> library(dict)
> d < - dict="" ="">->
> d[[1]] < - 42
> d[[c(2, 3)]] < - "Hello!"
> d[[“foo”]] < - "bar"
> d[[1]]
[1] 42
> d[[c(2, 3)]]
[1] “Hello!”
Under the hood, separate C++ dictionaries (unordered_map) are created for the different types of keys. Using R’s flexible types that are reflected in Rcpp (as SEXP), such a dictionary can store both numbers and strings (and other objects) at the same time.
The package is available on GitHub: https://github.com/mkuhn/dict
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