[R] question about technieque do with large computation

From: ronggui <042045003_at_fudan.edu.cn>
Date: Sun 23 Oct 2005 - 19:15:57 EST


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)}

2005-10-23



Deparment of Sociology
Fudan University

My new mail addres is ronggui.huang@gmail.com Blog:http://sociology.yculblog.com



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