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The R engine began life as a very simple Lisp interpreter. There is also an R package which gives the Lisp-style representation of an R expression. You can even

• bachmeier 7y ago
  Thanks. I wasn't aware of showTree. Most R users don't realize everything in R can be written as a function, due to its Scheme roots. Example: if (3 > 2) { print("hello") } can be rewritten with backticks on the if: `if`(3 > 2, print("hello")) If the first argument is false, you need a third argument `if`(3 < 2, print("hello"), print("go away")) Essentially, the backticks replace some parens you'd use in Scheme, and then you can add some alternative syntactic sugar to write in Algol style.
  • disgruntledphd2 7y ago
    Yup. If you look in the source for R (in C), you will note that all of the data structure names end with Sexp.