Iteration idioms & laziness
Alexander S?ndergaard wrote:
Hi all, I'm new to R. Having a functional background, I was wondering what's the idiomatic way to iterate. It seems that for loops are the default given there's no tail-call optimization. I'm curious to know whether there is a way to transform the following toy snippet into something that doesn't eat up gigabytes of memory (like it's for loop counterpart) using laziness:
Reduce('+', seq(1,1e6))
In this case sum(as.numeric(seq(1, 1e6))) or according to Gauss 1e6 * (1e6+1) / 2 but for more complicated problems it might be sensible to go the loop way ... Uwe Ligges
Thanks! Best regards, A.S.
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.