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s4groupgeneric s4 group generic functions rdrr io find an r package r language docs run r in your browser home r documentation methods s4groupgeneric s4 group generic functions s4groupgeneric s4 group generic functions s4groupgeneric r documentation s4 group generic functions description methods can be defined for group generic functions each group generic function has a number of member generic functions associated with it methods defined for a group generic function cause the same method to be defined for each member of the group but a method explicitly defined for a member of the group takes precedence over a method defined with the same signature for the group generic the functions shown in this documentation page all reside in the methods package but the mechanism is available to any programmer by calling setgroupgeneric provided package methods is attached usage s4 group generics arith e1 e2 compare e1 e2 ops e1 e2 logic e1 e2 math x math2 x digits summary x na rm false complex z arguments x z e1 e2 objects digits number of digits to be used in round or signif further arguments passed to or from methods na rm logical should missing values be removed details methods can be defined for the group generic functions by calls to setmethod in the usual way note that the group generic functions should never be called directly a suitable error message will result if they are when metadata for a group generic is loaded the methods defined become methods for the members of the group but only if no method has been specified directly for the member function for the same signature the effect is that group generic definitions are selected before inherited methods but after directly specified methods for more on method selection see methods_details there are also s3 groups math ops summary and complex see s3groupgeneric with no corresponding r objects but these are irrelevant for s4 group generic functions the members of the group defined by a particular generic can be obtained by calling getgroupmembers for the group generic functions currently defined in this package the members are as follows arith compare logic ops arith compare logic math abs sign sqrt ceiling floor trunc cummax cummin cumprod cumsum log log10 log2 log1p acos acosh asin asinh atan atanh exp expm1 cos cosh cospi sin sinh sinpi tan tanh tanpi gamma lgamma digamma trigamma math2 round signif summary max min range prod sum any all complex arg conj im mod re note that ops merely consists of three sub groups all the functions in these groups other than the group generics themselves are basic functions in r they are not by default s4 generic functions and many of them are defined as primitives however you can still define formal methods for them both individually and via the group generics it all works more or less as you might expect admittedly via a bit of trickery in the background see methods_details for details note that two members of the math group log and trunc have as an extra formal argument since methods for math will have only one formal argument you must set a specific method for these functions in order to call them with the extra argument s for further details about group generic functions see section 10 5 of the second reference references chambers john m 2016 extending r chapman hall chapters 9 and 10 chambers john m 2008 software for data analysis programming with r springer section 10 5 see also the function callgeneric is nearly always relevant when writing a method for a group generic see the examples below and in section 10 5 of software for data analysis see s3groupgeneric for s3 group generics examples setclass testcomplex slots c zz complex method for whole group complex setmethod complex testcomplex function z c groupmethod callgeneric z zz exception for arg setmethod arg testcomplex function z c argmethod arg z zz z1 1 2i z2 new testcomplex zz z1 stopifnot identical mod z2 c groupmethod mod z1 stopifnot identical arg z2 c argmethod arg z1 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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