[R] How to eliminate this for loop ?

[Nick Sabbe]

Whenever you use a recursion (that cannot be expressed otherwise), you
always need a (for) loop.
Apply and the like do not allow to use the intermediary results (i.e. a[i-1]
to calculate a[i]).

So: no, it cannot be avoided in your case, I guess.


Nick Sabbe
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of PLucas
Sent: maandag 8 november 2010 10:26
To: r-help at r-project.org
Subject: [R] How to eliminate this for loop ?


Hi, I would like to create a list recursively and eliminate my for loop :

a<-c()
a[1] <- 1; # initial value
for(i in 2:N) {
	a[i]<-a[i-1]*b - c[i-1] # b is a value, c is another vector
}


Is it possible ?

Thanks
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