On Tue, 6 Apr 2004 14:18:42 +0000 (UTC), you wrote:
>Robin Hankin <rksh <at> soc.soton.ac.uk> writes:
>> R> a <- matrix(1:9,3,3)
>> But the following caught me off-guard:
>> R> a <- matrix(1:9,3,3)
>> R> a[a%%2==1] %+=% 1000*(1:5)
>
>How about this way:
>
>> a <- matrix(1:9,3,3)
>> "plus<-" <- function(a,value) a+value
>> plus(a[a%%2==1]) <- 1000*(1:5)
>> a
> [,1] [,2] [,3]
>[1,] 1001 4 4007
>[2,] 2 3005 8
>[3,] 2003 6 5009
Wouldn't a clearer syntax to follow be Pascal's? I.e.
inc <- function(a, b) {
eval.parent(substitute(a <- a + b))
}
Then in order to increment x[3], you'd use
inc(x[3], 1)
etc.
Duncan Murdoch
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