| setOldClass {methods} | R Documentation |
Specify Names for Old-Style Classes
Description
The Classes argument is an old-style class assignment. In
particular, if there is more than one name, we expect old-style
class inheritance. Calling setOldClass establishes similar
inheritance for formal method dispatch, so that the class names can
be used in a call to setMethod.
Usage
setOldClass(Classes, where = 1)
Arguments
Classes |
A character vector of names for old-style classes. |
where |
Where to store the class definitions. |
Details
Each of the names will be defined as a virtual class, extending the
remaining classes in Classes, and the class
oldClass, which is the “root” of all old-style classes.
See the list .OldClassesList for the old-style classes that
are defined by the methods package. Each element of the list is an
old-style list, with multiple character strings if inheritance is
included.
Each element of the list was passed to setOldClass when
creating the methods package.
See Also
setClass, setMethod
Examples
setOldClass(c("mlm", "lm"))
setGeneric("dfResidual", function(model)standardGeneric("dfResidual"))
setMethod("dfResidual", "lm", function(model)model$df.residual)
## dfResidual will work on mlm objects as well as lm objects
myData <- data.frame(time = 1:10, y = (1:10)^.5)
myLm <- lm(cbind(y, y^3) ~ time, myData)
rm(myData, myLm)
removeGeneric("dfResidual")
removeClass("mlm")
removeClass("lm")