A correction to my previous post: after running the example A[,1] and A[[1]] the running time decrease so that eventually A[[1]] takes 0.025 seconds (according to system.time()) and A[,1] takes 1.8 seconds.
The ratio of time still 2-digit, but, apparently, the garbage collector is a
good deal faster when memory is already available.
best
Vladimir Dergachev
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