r - foreach cannot find `i` used in foreach(i=1:N) -

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i'm having troubles variables inside foreach. load cluster , set couple of vectors:

library(doparallel) ncores <- detectcores() - 2 cl <- makecluster(ncores, outfile="", port=11439) registerdoparallel(cl)      results <- rep(na,10) values <- 20:30

then, not work:

# error: object 'i' not found foreach(i=1:10) %dopar%    results[i] <-  stopcluster(cl)

while does:

# ok  foreach(i=1:10) %dopar%    values[i]  stopcluster(cl)

how come finds i when used inside [i] in left hand side, not find when used in right hand side?

from comment:

try curly braces.

foreach(i=1:10) %dopar% {   results[i] <- }

not example, experienced better use curly braces in r. many problems can avoided using them. , apparently there more advantages of these little helpers, may see while browsing through internets (e.g. see here).


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