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# foreach version based on for-loop version from Wikipedia
# http://en.wikipedia.org/wiki/Bootstrapping_(statistics)
library(foreach)
data(iris)
x <- iris[which(iris[,5] != "setosa"), c(1,5)]
trials <- 10000
nwsopts <- list(chunkSize=150)
# Can use the following "final" function instead of
# using cbind as the "combine" function.
final <- function(a) do.call('cbind', a)
print(system.time(
r <- foreach(icount(trials), .final=final, .options.nws=nwsopts) %dopar% {
ind <- sample(100, 100, replace=TRUE)
result1 <- glm(x[ind,2]~x[ind,1], family=binomial(logit))
coefficients(result1)
}
))
hist(r[1,], breaks=40)
dev.new()
hist(r[2,], breaks=40)
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