[R] foreach(): how to do calculations "between" two foreach loops?

[Marius Hofert]

Dear expeRts,

is it possible to carry out calculations between different foreach() calls? 
As for nested loops, you want to carry out calcuations not depending on the inner
loop only once and not for each iteration of the innermost loop.

Cheers,

Marius


library(foreach)

foreach(i=1:3) %:% 
    foreach(j=1:2) %do% {
	    i <- i+1 
        print(paste(i,j))
    }

foreach(i=1:3) %:% 
    i <- i+1 # lengthy calculation which has to be done only once, not for each j 
    foreach(j=1:2) %do% {
        print(paste(i,j))
    }