By Michael Kuhn
(This article was first published on bioCS, and kindly contributed to R-bloggers)
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:
> library(dict)
> d ->
> d[[1]]
> d[c(2, 3)]
> d[[“foo”]]
> 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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