Dear All,
I have a question of how to export S4 class specification to
clusters/workers in parallel computing. The package I used is snowfall. The
problem is reproducible as follows. Any hint is greatly appreciated.
Edwin Sun
=== begin ===========
library(snowfall)
sfInit(parallel = TRUE, cpus = 2)
setClass("catt", representation(aa = "numeric"))
setClass("dogg", representation(bb = 'character', cc = "catt"))
f1 <- function(y1) { new('catt', aa = y1 + 1) }
f3 <- function(y2, y3) { new('dogg', bb=c(y2, 'GA'), cc = f1(y3)) }
dat <- 1:5
f1(dat)
f3('NY', dat)
sapply(c("state1", 'state2', 'state3'), f3, dat)
sfExportAll()
sfClusterEval(ls())
sfSapply(c("s1", 's2', 's3'), f3, dat)
sfStop()
# sfSapply generates the following error
# Error in checkForRemoteErrors(val) :
# 2 nodes produced errors; first error: "dogg" is not a defined class
=== end =============
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