I don't think you have gotten the basic idea of functions in R. Those
functions would return only the value of the last evaluated
expression, e.g. (1+par[1]) in the case of f1, but most of the code
appears to have no effect. See this simple example:
> x1 <- 4
> f1 <- function(x) x1 <- x
> f1(1)
> x1
[1] 4 # nothing happens to the x1 in the enclosing environment,; the
one inside the function is gone.
The "x1" inside the function "f1" is local to the function and has no
persistency after the evaluations are completed..
f4 <- function(par) {1+par[4]} # would have same effect as your f1
> f4(1:4)
[1] 5
You should tell us what you actually want to do. You generally call
functions with a particular set of arguments for which you have
provided no examples and then expect those functions to return some
sort of object which you have also not defined.
--
David Winsemius
On Mar 15, 2009, at 9:36 AM, Axel Urbiz wrote:
Dear All,
Im a new R user. How can I write code below more efficiently
(using a
loop for example)?
f1 <-function(par){x1 <- par[1]; x2 <- par[2];x3 <- par[3] ; x4 <-
par[4]
; (1+x1)}
f2 <-function(par){x1 <- par[1]; x2 <- par[2];x3 <- par[3] ; x4 <-
par[4]
;(1+x2)}
f3 <-function(par){x1 <- par[1]; x2 <- par[2];x3 <- par[3] ; x4 <-
par[4]
; (1+x3)}
f4 <-function(par){x1 <- par[1]; x2 <- par[2];x3 <- par[3] ; x4 <-
par[4] ;
(1+x4)}
Each function has four parameters independently on whether a specific
variable is explicitly in the function or not.
Many thanks for your help!
Axel.
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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and provide commented, minimal, self-contained, reproducible code.
