Apply a function over a ragged array
tapply applies a function to each cell of a ragged array,
that is to each (non-empty) group of values given by a unique
combination of the levels of certain factors.
NOTE: This man page is for the tapply S4 generic function
defined in the BiocGenerics package.
See ?base::tapply for the default method
(defined in the base package).
Bioconductor packages can define specific methods for objects
(typically list-like or vector-like) not supported by the
default method.
tapply(X, INDEX, FUN=NULL, ..., default=NA, simplify=TRUE)
X |
The default method expects an atomic object, typically a vector.
See Specific methods can support other objects (typically list-like or vector-like). Please refer to the documentation of a particular method for the details. |
INDEX |
The default method expects a list of one or more factors, each of same
length as Specific methods can support other objects (typically list-like). Please refer to the documentation of a particular method for the details. |
FUN, ..., default, simplify |
See |
See ?base::tapply for the value returned by the
default method.
Specific methods defined in Bioconductor packages should behave as consistently as possible with the default method.
base::tapply for the default tapply
method.
showMethods for displaying a summary of the
methods defined for a given generic function.
selectMethod for getting the definition of
a specific method.
tapply,Vector,ANY-method in the IRanges
package for an example of a specific tapply method (defined
for Vector objects).
BiocGenerics for a summary of all the generics defined in the BiocGenerics package.
tapply # note the dispatch on the 'X' and 'INDEX' args only
showMethods("tapply")
selectMethod("tapply", c("ANY", "ANY")) # the default methodPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.