並行for循環R

Question

我正在調用for循環中的函數。

sample_fun <- function(x,y) { 
    # do something with x,y and return value 
} 

My loop looks like 
result = list() 

for(i in 1:10000) 
    result[i] = sample_fun(i,i+1) 

我該如何並行化這個循環。使用foreach和dopar會導致下標錯誤。

Answer 1

library(doSNOW) 

sample_fun <- function(x,y) { 
    # do something with x,y and return value 
} 

threads <- 8 
N <- 10000 

cl <- makeCluster(threads) 
registerDoSNOW(cl) 

result <- foreach(i=1:N) %dopar% sample_fun(i,i+1) 

stopCluster(cl) 

http://www.joyofdata.de/blog/parallel-computing-r-windows-using-dosnow-foreach/