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2017 Aug 04
2
Why is as.function() slower than eval(call("function"())?
...1950 9.852 100 a
# make_fn_2(a, b) 3.541 3.7230 4.13400 3.906 4.1055 23.153 100 b
At first I thought the gap was due to the overhead of calling c(a, list(b)). But this turns out not to be the case:
make_fn_weird <- function(a, b) as.function(c(a, b), env = parent.frame())
b_wrapped <- list(b)
make_fn_weirder <- function(a_b) as.function(a_b, env = parent.frame())
a_b <- c(a, b_wrapped)
microbenchmark(make_fn_1(a, b), make_fn_2(a, b),
make_fn_weird(a, b_wrapped), make_fn_weirder(a_b))
# Unit: microseconds
#...