Apply a function over a list-like or vector-like object
lapply returns a list of the same length as X, each
element of which is the result of applying FUN to the
corresponding element of X.
sapply is a user-friendly version and wrapper of lapply
by default returning a vector, matrix or, if simplify="array",
an array if appropriate, by applying simplify2array().
sapply(x, f, simplify=FALSE, USE.NAMES=FALSE) is the same
as lapply(x, f).
NOTE: This man page is for the lapply and sapply
S4 generic functions defined in the BiocGenerics package.
See ?base::lapply for the default methods
(defined in the base package).
Bioconductor packages can define specific methods for objects
(typically list-like or vector-like) not supported by the
default methods.
lapply(X, FUN, ...) sapply(X, FUN, ..., simplify=TRUE, USE.NAMES=TRUE)
X |
A list-like or vector-like object. |
FUN, ..., simplify, USE.NAMES |
See |
See ?base::lapply for the value returned by the
default methods.
Specific methods defined in Bioconductor packages should
behave as consistently as possible with the default methods.
In particular, lapply and sapply(simplify=FALSE)
should always return a list.
base::lapply for the default lapply and
sapply methods.
showMethods for displaying a summary of the
methods defined for a given generic function.
selectMethod for getting the definition of
a specific method.
lapply,List-method in the S4Vectors package
for an example of a specific lapply method (defined for
List objects).
BiocGenerics for a summary of all the generics defined in the BiocGenerics package.
lapply # note the dispatch on the 'X' arg only
showMethods("lapply")
selectMethod("lapply", "ANY") # the default method
sapply # note the dispatch on the 'X' arg only
showMethods("sapply")
selectMethod("sapply", "ANY") # the default methodPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.