Manipulating Expressions
Thomas Mailund · Apress eBooks · 2017
Expressions, the kind you create using the quote function, come in four flavors: a primitive value, a name, a function call or a control structure, and a pairlist. Function calls include operators such as the arithmetic or logical operators because these are function calls as well in R, and control structures can be considered just a special kind of function calls—they only really differ from function calls in the syntax you use to invoke them. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.