ronggui wrote:
> The green book tells:"The basic technique is classic :keep it simple ."A long
> ,complicated expression or function is less fravorable than" a relatively
> small computations that combines calls to a few other functions to perform
> its tasks."
>
> But I don't get the point totally.Can anyone give me an example to make me
> understand this rules totally?
>
> ps:
> Is it mean that f1 is better than f2? Thank you!
>
>
> f1<-function(x){
> n<-length(x)
> s<-sum(x)
> m<-s/n}
>
> f2<-
> function(x){
> m<-sum(x)/length(x)}
No, it means collecting sensible small parts of the code into separate
functions as in
f1 <- function(x, .....){
x1 <- f1a(x, ......)
x2 <- f1b(x1, .....)
x3 <- f1a(x2, .....)
f1c(x1, x2, x3, .....)
}
which is "better" than
f2 <- function(.....){
##
## many lines calculating stuff as in f1a
##
## many lines calculating stuff as in f1b
##
## many lines calculating stuff as in f1a
##
## many lines calculating stuff as in f1c
##
}
Uwe Ligges
>
> 2005-10-23
>
> ------
> Deparment of Sociology
> Fudan University
>
> My new mail addres is [EMAIL PROTECTED]
> Blog:http://sociology.yculblog.com
>
>
>
> ------------------------------------------------------------------------
>
> ______________________________________________
> [email protected] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
