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 a functionNot every function call in R makes use of all the formalargumentsFunction arguments can bemissingor might have defaultvaluesThe R LanguageArgument MatchingR Functions arguments can be matched positionally or
However, in R you can have functions de ned inside other functions Languages like C don’t let you do this Now things get interesting | In this case the environment in which a function is de ned is the body of another function! The R Language. Lexical Scoping make.power <- function(n)
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