[R] help!!!

[guowei at stat.osu.edu]

Hi,

I want to ask a question about expression for object.
In the example parts, I saw
 trig.exp <- expression(sin(cos(x + y^2)))
 D(trig.exp, c("x", "y"))

Now, I want to define a complex function in "expression", for example,
f1(x)=...
         f2(y)=..
         final f=f2(f1(x)+4)

may I define such expression with many statements?
thanks.

regards,
wei


-- 
Wei Guo
Department of Statistics
The Ohio State University
Columbus, Ohio 43210
Tel: 001-614-292-4713(o)
e-mail: guowei at stat.osu.edu