| lapply {base} | R Documentation |
Apply a Function over a List or Vector
Description
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 of lapply also
accepting vectors as X, and returning a vector or array with
dimnames if appropriate.
Usage
lapply(X, FUN, ...)
sapply(X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)
Arguments
X |
list or vector to be used. |
FUN |
the function to be applied.
In the case of functions like |
... |
optional arguments to |
simplify |
logical; should the result be simplified to a vector if possible? |
USE.NAMES |
logical; if |
See Also
apply, tapply.
Examples
x <- list(a = 1:10, beta = exp(-3:3), logic = c(TRUE,FALSE,FALSE,TRUE))
# compute the list mean for each list element
lapply(x,mean)
# median and quartiles for each list element
lapply(x, quantile, probs = 1:3/4)
sapply(x, quantile)
str(i39 <- sapply(3:9, seq))# list of vectors
sapply(i39, fivenum)