snow (version 0.4-3)

snow-parallel: Higher Level SNOW Functions

Description

Parallel versions of apply and related functions.

Usage

parLapply(cl, x, fun, ...)
parSapply(cl, X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE) 
parApply(cl, X, MARGIN, FUN, ...)
parRapply(cl, x, fun, ...)
parCapply(cl, x, fun, ...)
parMM(cl, A, B)

Arguments

cl

cluster object

fun

function or character string naming a function

X

array to be used

x

matrix to be used

FUN

function or character string naming a function

MARGIN

vector specifying the dimensions to use.

simplify

logical; see sapply

USE.NAMES

logical; see sapply

...

additional arguments to pass to standard function

A

matrix

B

matrix

Details

parLapply, parSapply, and parApply are parallel versions of lapply, sapply, and apply.

parRapply and parCapply are parallel row and column apply functions for a matrix x; they may be slightly more efficient than parApply.

parMM is a very simple(minded) parallel matrix multiply; it is intended as an illustration.

For more details see http://www.stat.uiowa.edu/~luke/R/cluster/cluster.html.

Examples

# NOT RUN {
  
# }
# NOT RUN {
cl <- makeSOCKcluster(c("localhost","localhost"))
parSapply(cl, 1:20, get("+"), 3)
  
# }