Description Usage Arguments Value See Also Examples
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.
1 2 |
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.
1 2 3 4 5 6 7 | 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 method
|
Loading required package: parallel
Attaching package: 'BiocGenerics'
The following objects are masked from 'package:parallel':
clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
clusterExport, clusterMap, parApply, parCapply, parLapply,
parLapplyLB, parRapply, parSapply, parSapplyLB
The following objects are masked from 'package:stats':
IQR, mad, xtabs
The following objects are masked from 'package:base':
Filter, Find, Map, Position, Reduce, anyDuplicated, append,
as.data.frame, cbind, colnames, do.call, duplicated, eval, evalq,
get, grep, grepl, intersect, is.unsorted, lapply, lengths, mapply,
match, mget, order, paste, pmax, pmax.int, pmin, pmin.int, rank,
rbind, rownames, sapply, setdiff, sort, table, tapply, union,
unique, unsplit, which, which.max, which.min
standardGeneric for "lapply" defined from package "BiocGenerics"
function (X, FUN, ...)
standardGeneric("lapply")
<environment: 0x32e51a8>
Methods may be defined for arguments: X
Use showMethods("lapply") for currently available ones.
Function: lapply (package BiocGenerics)
X="ANY"
Method Definition (Class "derivedDefaultMethod"):
function (X, FUN, ...)
{
FUN <- match.fun(FUN)
if (!is.vector(X) || is.object(X))
X <- as.list(X)
.Internal(lapply(X, FUN))
}
<environment: namespace:base>
Signatures:
X
target "ANY"
defined "ANY"
standardGeneric for "sapply" defined from package "BiocGenerics"
function (X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)
standardGeneric("sapply")
<environment: 0x30fd220>
Methods may be defined for arguments: X
Use showMethods("sapply") for currently available ones.
Function: sapply (package BiocGenerics)
X="ANY"
Method Definition (Class "derivedDefaultMethod"):
function (X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)
{
FUN <- match.fun(FUN)
answer <- lapply(X = X, FUN = FUN, ...)
if (USE.NAMES && is.character(X) && is.null(names(answer)))
names(answer) <- X
if (!identical(simplify, FALSE) && length(answer))
simplify2array(answer, higher = (simplify == "array"))
else answer
}
<environment: namespace:base>
Signatures:
X
target "ANY"
defined "ANY"
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