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
dat$ytrt[targets]<-dat$ytrt[targets]+0.5
dat$cony[targets]<-dat$cony[targets]+0.5
dat$trty[targets]<-dat$trty[targets]+0.5
)
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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