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20872
2006 Oct 26
2
how to determine if a function's result is invisible
Suppose we have a function such as the following
F <- function(f, x) f(x)+1
which runs function f and then transforms it. I would like the
corresponding function which works the same except that
unlike F returns an invisible result if and only if f does.
Is there some way of determining whether f returns
an invisible result or not?
Thus we want this:
f <- function(x) x
g <-