Hi all, Most of the time in my programming I use "for" loop however there will always be some way to use other loop like "while", "if" etc to implement same query. My question is among those different loops which is theoretically fastest and why? Thanks -- View this message in context: http://www.nabble.com/Programming-insight-tp25530722p25530722.html Sent from the R help mailing list archive at Nabble.com.