On Tue, 27 Jul 2010, Prof Brian Ripley wrote :
>
> Note that raw values in R are really intended to be passed around and not
> manipulated: if you do much of the latter, coercing to integer, say, is
> likely to be much more efficient.
>
> Indeed :
I tried a minimal benchmark :
a <- charToRaw(paste(citation(), "\002", licence(), "\003", "garbage"))
proc.time()
for (i in 1:10000) {
j0 <- match (as.raw(2), a)
j1 <- match (as.raw(3), a)
}
proc.time()
for (i in 1:10000) {
b <- as.integer(a)
j0 <- match (2, b)
j1 <- match (3, b)
}
proc.time()
In this case, the solution using as.integer() looks about 4 time faster.
Bruno.
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