lapply(X, FUN, ...) sapply(X, FUN, ..., simplify = TRUE)
X
|
list (or vector for sapply) 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? |
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.
apply, tapply.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) sapply(sapply(3:9, seq), fivenum)