Transcription of Introduction to the R Language - Functions
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Introduction to the R Language - Functions
Introduction to the R LanguageFunctionsBiostatistics R LanguageFunctionsFunctions are created using thefunction()directive and arestored as R objects just like anything else. In particular, they are Robjects of class function .f <- function(<arguments>) {## Do something interesting} Functions in R are first class objects , which means that they canbe treated much like any other R object. Importantly, Functions can be passed as arguments to other functionsFunctions can be nested, so that you can define a functioninside of another functionThe return value of a function is the last expression in the functionbody to be R LanguageFunction ArgumentsFunctions havenamed argumentswhich potentially argumentsare the arguments included in thefunction definitionTheformalsfunction returns a list of all the formalarguments of
An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value. Every environment has a parent environment; it is possible for an environment to have multiple \children" the only environment without a parent is the empty environment A function + an environment = a closure or function closure. The R Language
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