creating function bodies using body()
Defining a function is much simpler than that:
tmpfun <- function(a, b=2)
{ z <- a = b
z^2 } # returns (a + b)^2
But maybe you want the advertised syntax to work. Please
pardon if I've misjudged the depth of your question. I've
never tried to use body().
- tom blackwell - u michigan medical school - ann arbor -
On Fri, 4 Apr 2003 Setzer.Woodrow at epamail.epa.gov wrote:
I'm having trouble figuring out how to create a function using "body<-" (). The help file for body() says that the argument should be a list of R expressions. However if I try that I get an error:
tmpfun <- function(a, b=2){}
body(tmpfun) <- list(expression(z <- a + b),expression(z^2))
Error in as.function.default(c(formals(f), value), envir) :
invalid formal argument list for "function"
Can someone give me a simple example for doing this? Thanks!
R. Woodrow Setzer, Jr. Phone: (919) 541-0128
Experimental Toxicology Division Fax: (919) 541-4284
Pharmacokinetics Branch
NHEERL B143-05; US EPA; RTP, NC 27711