y <- rep(NA, length(x))
a <- 2:length(x)
y[a] <- complexFn( x[a-1], x[a] )
> y
[1] NA 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
--
David Winsemius
On Nov 12, 2008, at 12:48 AM, Kinoko wrote:
Thanks for the replies
Sorry for being unclear.
I am asking if there is a way to process a vector in a way
that uses references to other elements of the same vector.
And doing this without a for-loop.
Here is a running code:
<code>
complexFn <- function(a,b){
c <- (a+b)/2
return(c)
}
x <- 1:10
y <- rep(NA, length(x))
for (i in 1:length(x)){
if(i>1){
y[i] = complexFn(x[i-1], x[i])
}
}
print(y)
</code>
And here is another attempt without the for-loop.
<code>
x <- 1:10
x1 <- c(NA, x)
length(x1)<-length(x)
y<-mapply(complexFn,x,x1)
print(c(y))
</code>
If someone could tell me the normal/elegant/effective/R way of
doing this kind of vector processing, that would highly appreciated.
best,
gabor
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