Hi all,
Does there already exist a version of substitute that evaluates it's
first argument? (i.e. it accepts an already quoted expression). This
seems like something that's pretty handy, but I haven't found any
existing function to do it:
substitute_e <- function(expr, env) {
eval(substitute(substitute(expr, env), list(expr = expr)))
}
f <- quote(x + y + z)
substitute(f, list(y = 1, z = as.name("b")))
substitute_e(f, list(y = 1, z = as.name("b")))
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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