# This script is executed via the command line `Rscript call-fun.R arg1 arg2`,
# where arg1 is a path to an .rds file, which contains the function and its
# arguments saved as a list, and arg2 is a path to an .rds file to which the
# returned value of the function call is saved.
local({
if (length(a <- commandArgs(TRUE)) != 2)
stop('The number of arguments passed to Rscript should be 2.')
x = readRDS(a[1]) # list(fun, args)
f = x[[1]]
if (is.character(f)) f = eval(parse(text = f), envir = globalenv())
r = do.call(f, x[[2]], envir = globalenv())
saveRDS(r, a[2])
})
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