[Rd] parLapply fails to detect default cluster?

[Martin Morgan]

invoking parLapply without a cluster fails to find a previously 
registered cluster

 > library(parallel)
 > setDefaultCluster(makePSOCKcluster(2))
 > parLapply(X=1:2, fun=function(...) {})
Error in cut.default(i, breaks) : invalid number of intervals

This is because in parLapply length(cl) is determined before 
defaultCluster(cl) is called. By inspection, this appears to be true of 
other high-level functions, but ironically not of parApply.

In defaultCluster, t would also be helpful to check that the detected 
cluster, user-supplied or other, is a valid cluster.

diff attached.

Martin
-- 
Computational Biology / Fred Hutchinson Cancer Research Center
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Phone: (206) 667-2793
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