Dear all,
I have the following problem.
Given an expression object 'expr' containing a certain set of symbols
(say 'a', 'b', 'c'), I would like to translate the expression object
in an R function of, say, 'a', programmatically. Here an example of
what I mean.
Given:
expr - expression(a+b+c)
a
On Mon, 2006-12-18 at 19:06 +0100, Antonio, Fabio Di Narzo wrote:
Dear all,
I have the following problem.
Given an expression object 'expr' containing a certain set of symbols
(say 'a', 'b', 'c'), I would like to translate the expression object
in an R function of, say, 'a',
Here is one possibility. It does not use the second argument in your function
call but instead assumes the arguments of the output function are
those variables
in the expression that have not been assigned in the list L in the
order encountered.
library(gsubfn)
asFun - function(e, L = NULL, env
This is what I tried, and it seemed to work, but maybe others can give
better ideas, and also explain why the first attempt to assign the
formal arguments didn't work (but the second did.)
f - function() NULL
formals(f) - list(b=1, c=2)
f
function (b = 1)
2
formals(f) - list(b=1, c=2)
