as.function is a generic function which is used to convert
objects to functions.
as.function.default works on a list
x, which should contain the
concatenation of a formal argument list and an expression or an
object of mode
"call" which will become the function body.
The function will be defined in a specified environment, by default
that of the caller.
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object to convert, a list for the default method.
additional arguments, depending on object
environment in which the function should be defined
The desired function.
For ancient historical reasons,
envir = NULL uses the global
environment rather than the base environment.
envir = globalenv() instead if this is what you want,
as the special handling of
NULL may change in a future release.
alist which is handy for the construction of
argument lists, etc.
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