[R] function application
Phil Spector
spector at stat.berkeley.edu
Tue Jan 25 23:12:01 CET 2011
?do.call
Please provide a reproducible example if the help file is
not sufficient.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spector at 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.
>
> [[alternative HTML version deleted]]
>
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