| lapply {base} | R Documentation |
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.
lapply(X, FUN, ...) sapply(X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)
X |
list or vector to be used. |
FUN |
the function to be applied.
In the case of functions like +,
%*%, etc., the function name must be quoted. |
... |
optional arguments to FUN. |
simplify |
logical; should the result be simplified to a vector if possible? |
USE.NAMES |
logical; if TRUE and if X is character,
use X as names for the result unless it had names
already. |
x <- list(a = 1:10, beta = exp(-3:3), logic = c(T,F,F,T)) # 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)