Hi List,
Trying to update a data.frame column within a foreach nested for loop
### trial data
set.seed(666)
xyz<-as.data.frame(cbind(x=rep(rpois(5000,10),2)+1,
y=rep(rpois(5000,10),2)+1,z=round(runif(10000, min=-3, max=40),2)))
xyz$mins<-rep(NA, nrow(xyz))
cl<-makeCluster(16) #adjust to your cluster number
registerDoParallel(cl)
counter=0
foreach(i=unique(xyz[,1]), .combine=data.frame, .verbose=T) %dopar% {
for( j in unique(xyz[,2])) {
xyz[xyz[,2] == j ,4]<-min(xyz[xyz[,2] == j ,2])
}
}
stopCluster(cl)
This is obviously not working. Any hints?
Thanx
Herry
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