/usr/lib/R/site-library/foreach/examples/colMeans.R is in r-cran-foreach 1.4.4-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | # compute the mean of the columns and the rows of a matrix
library(foreach)
# generate the input matrix
x <- matrix(rnorm(100 * 100), 100)
# compute the mean of each column of x
cmeans <- foreach(i=1:ncol(x), .combine=c) %do% mean(x[,i])
# check the results
expected <- colMeans(x)
print(all.equal(cmeans, expected))
# compute the mean of each row of x
rmeans <- foreach(i=1:nrow(x), .combine=c) %do% mean(x[i,])
# check the results
expected <- rowMeans(x)
print(all.equal(rmeans, expected))
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