I thought it would be possible to make rep() work for functions
by writing a method for the function class. I tried:
rep.function <- function(x,...) {
times <- as.list(...)[[1]]
rslt <- vector("list",times)
rslt[1:times] <- list(x)
rslt
}
But then doing
rep(sin,2)
still gave an error --- Error: object of type 'builtin' is not
subsettable
Note the difference: ``builtin'' rather than ``closure''.
I then noticed that there is no generic function for rep, although
there are ***methods*** for rep. I don't understand this at all!
So I did:
rep.default <- rep
rep <- function(x,...){UseMethod("rep")}
Having taken these steps, rep(sin,2) worked as expected.
But why doesn't rep() have a generic form? And how can there
be methods ***without*** a generic? Can anyone explain the
issues to me, preferably in terms that are comprehensible to
the human mind (which is what I'm equipped with)?
cheers,
Rolf Turner
On 14/01/2010, at 2:24 PM, Gabor Grothendieck wrote:
See ?rep where it says that the argument must be a vector. Try
rep(list(sin), 3)
On Wed, Jan 13, 2010 at 8:11 PM, Matthew Walker
<matthew.walke...@ulaval.ca> wrote:
Hi everyone,
Would somebody please explain (or point me to a reference that
explains) the
following error:
"Error: object of type 'closure' is not subsettable"
I was trying to use rep() to replicate a function:
example_function <- function() { return(TRUE) }
rep(example_function, 3)
Error: object of type 'closure' is not subsettable
But I just cannot understand this error. I can combine functions
using "c"
without any problems:
c(example_function, example_function)
[[1]]
function ()
{
return(TRUE)
}
[[2]]
function ()
{
return(TRUE)
}
What am I doing wrong when I use rep()?
Thanks in advance,
Matthew Walker
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