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) { pr

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.