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representation construct a representation or a prototype for a class rdrr io find an r package r language docs run r in your browser home r documentation methods representation construct a representation or a prototype for a class representation construct a representation or a prototype for a class representation r documentation construct a representation or a prototype for a class definition description these are old utility functions to construct respectively a list designed to represent the slots and superclasses and a list of prototype specifications the representation function is no longer useful since the arguments slots and contains to setclass are now recommended the prototype function may still be used for the corresponding argument but a simple list of the same arguments works as well usage representation prototype arguments the call to representation takes arguments that are single character strings unnamed arguments are classes that a newly defined class extends named arguments name the explicit slots in the new class and specify what class each slot should have in the call to prototype if an unnamed argument is supplied it unconditionally forms the basis for the prototype object remaining arguments are taken to correspond to slots of this object it is an error to supply more than one unnamed argument details the representation function applies tests for the validity of the arguments each must specify the name of a class the classes named don t have to exist when representation is called but if they do then the function will check for any duplicate slot names introduced by each of the inherited classes the arguments to prototype are usually named initial values for slots plus an optional first argument that gives the object itself the unnamed argument is typically useful if there is a data part to the definition see the examples below value the value of representation is just the list of arguments after these have been checked for validity the value of prototype is the object to be used as the prototype slots will have been set consistently with the arguments but the construction does not use the class definition to test validity of the contents it hardly can since the prototype object is usually supplied to create the definition references chambers john m 2008 software for data analysis programming with r springer for the r version chambers john m 1998 programming with data springer for the original s4 version see also setclass examples representation for a new class with a directly define slot smooth which should be a numeric object and extending class track representation track smooth numeric this is old syntax use contains slots instead setclass character representation character setclass typedcharacter representation character type character prototype character 0 type plain ttt new typedcharacter foo type character setclass num1 representation comment character contains numeric prototype prototype pi comment start with pi methods as force an object to belong to a class basicclasses classes corresponding to basic data types callgeneric call the current generic function from a method cancoerce can an object be coerced to a certain s4 class cbind2 combine two objects by columns or rows classes s4 class documentation classes_details class definitions classestoam compute an adjacency matrix for superclasses of class classname class names including the corresponding package classrepresentation class class objects documentation using and creating on line documentation for classes and dotsmethods the use of in method signatures emptymethodslist class internal class representing empty methods list environmentclass class environment evalsource use function definitions from a source file without findclass find class definitions findmethods description of the methods defined for a generic function fixprevious fix objects saved from r versions previous to 1 8 genericfunction class generic function objects genericfunctions tools for managing generic functions getclass get class definition getmethod get or test for the definition of a method getpackagename the name associated with a given package hasarg look for an argument in the call implicitgeneric manage implicit versions of generic functions inheritedslotnames names of slots inherited from a super class initialize methods methods to initialize new objects from a class introduction basic use of s4 methods and classes is is an object from a class issealedmethod check for a sealed method or class languageclasses classes to represent unevaluated language objects languageel elements of language objects linearmethodslist class class linearmethodslist localrefclass localized objects based on reference classes methoddefinition class classes to represent method definitions methods s4 class documentation methods defunct defunct functions in package methods methods deprecated deprecated functions in package methods methods_details general information on methods methods_for_nongenerics methods for non generic functions in other packages methods_for_s3 methods for s3 and s4 dispatch method skeleton create a skeleton file for a new method methodslist methodslist objects methodslist class class methodslist defunct representation of methods methods package formal methods and classes methodsupport additional support functions for methods methodutilities utility functions for methods and s plus compatibility methodwithnext class class methodwithnext new generate an object from a class nextmethod call an inherited method nonstructure class a non structure s4 class for basic types objectswithpackage class a vector of object names with associated package names promptclass generate a shell for documentation of a formal class promptmethods generate a shell for documentation of formal methods rclassutils utilities for managing class definitions refclass objects with fields treated by reference oop style removemethod remove a method representation construct a representation or a prototype for a class rmethodutils method utilities s3part s4 classes that contain s3 classes s4groupgeneric s4 group generic functions sclassextension class class to represent inheritance extension relations selectsuperclasses super classes of specific kinds of a class setas methods for coercing an object to a class setclass create a class definition setclassunion classes defined as the union of other classes setgeneric create a generic version of a function setgroupgeneric create a group generic version of a function setis specify a superclass explicitly setloadactions set actions for package loading setmethod create and save a method setoldclass register old style s3 classes and inheritance setsclass create a class definition show show an object showmethods show all the methods for the specified function s or class signature class class signature for method definitions slot the slots in an object from a formal class stdrefclass class envrefclass structureclasses classes corresponding to basic structures substitutedirect substitutedirect testinheritedmethods test for and report about selection of inherited methods traceclasses classes used internally to control tracing validobject test the validity of an object zbasicfunslist list of builtin and special functions what can we improve the page or its content looks wrong i can t find what i m looking for i have a suggestion other extra info optional submit improve this page r package documentation rdrr io home r language documentation run r code online browse r packages cran packages bioconductor packages r forge packages github packages we want your feedback note that we can t provide technical support on individual packages you should contact the package authors for that tweet to rdrrhq github issue tracker ian mutexlabs com personal blog embedding an r snippet on your website add the following code to your website remove this copy to clipboard for more information 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