Re: [R] Another Loop

On Sep 29, 2009, at 5:53 PM, Antonio Paredes wrote: Hello everyone, Can somebody give a hint on how to go about speeding the following loop: You could try a loop-less approach: system.time( targets <- dat$ycon[i]==0 | dat$ytrt[i]==0 dat$ycon[targets]<-dat$ycon[targets]+0.5 da

[R] Another Loop

Hello everyone, Can somebody give a hint on how to go about speeding the following loop: system.time( for(i in 1:nrow(dat)){ if(dat$ycon[i]==0 || dat$ytrt[i]==0) dat$ycon[i]<-dat$ycon[i]+0.5 dat$ytrt[i]<-dat$ytrt[i]+0.5 dat$cony[i]<-dat$cony[i]+0.5 dat$trty[i]<-dat$trty[i]+0.5 }