?do.call
Please provide a reproducible example if the help file is
not sufficient.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Tue, 25 Jan 2011, Roy Shimizu wrote:
Suppose I have a function, like list, that takes a variable number of
arguments, and I have those arguments in some vector x. How can execute the
function with the *contents* of x as its arguments? I.e., I don't want
list(x), but rather list(x[[1]], x[[2]], ..., x[[n]]), but I don't want to
spell out the individual elements of x (either because I want to do this
programmatically, so I cannot code an expression like
list(x[[1]],...,x[[n]]) because the value of n is not know until run time,
or else, simply to avoid the tedium of typing out all the elements of x
individually).
Thanks!
Roy
P.S. In Python, if x is some sequence-like object (e.g. a list or a tuple),
and f is some function, the expression f(*x) causes f to be called with the
*contents* of x as its arguments. (This is to be distinguished from f(x),
which calls f with x as its sole argument.) In Mathematica, one can achieve
a similar effect using the Apply function: Apply[f, x]. I'm looking for the
equivalent of this in R.
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