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make_fn_1
2017 Aug 04
2
Why is as.function() slower than eval(call("function"())?
(Apologies if this is better suited for R-help.)
On my system (macOS Sierra, late 2014 MacBook Pro; R 3.4.1, Homebrew build), I found that it is faster to construct a function using eval(call("function", ...)) than using as.function(list(...)). Example:
make_fn_1 <- function(a, b) eval(call("function", a, b), env = parent.frame())
make_fn_2 <- function(a, b)