fun2name
compares a function (body) to all defined functions. If an
identical match is found to a defined function, that function is returned.
NB. This does not search through S4 methods.
fun2name(f)
name2fun(x)
fun2name
compares the function against existing functions using
identical
. If a match is found, the name of the matching
function ( expressed as a character
) is returned.
fun2name
will not work for S4 Methods.
name2fun
simply converts its argument to a name and than evals it
to produce a function definition