sub question
Gabor Grothendieck wrote:
On Sat, Jan 31, 2009 at 6:01 PM, Wacek Kusnierczyk
th some additional boring pedantry wrt. ?gsubfn, which says:
" If 'replacement' is a formula instead of a function then a one
line function is created whose body is the right hand side of the
formula and whose arguments are the left hand side separated by
'+' signs (or any other valid operator). The environment of the
function is the environment of the formula. If the arguments are
omitted then the free variables found on the right hand side are
used in the order encountered. "
to my little mind, all of 'paste', 'rep', 'nchar', and 'x' in the
example above are *free variables* on the right of the formula. you
The first three are functions, not variables.
They are still free variables, subject to the same rules of variable lookup. Wacek is right: The RHS is scanned recursively for objects of mode "name" _except_ when they appear as function names (i.e. if subexpression e is mode "call", then forget e[[1]] and look at the arguments in as.list(e)[-1]. Not sure if this also happens if e[[1]] is not a name, e.g. in f(a)(b), do you get both a and b or just b?) He is also right that it is pedantry...
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