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A general description is here.
On Windows, the C stack size has been increased to 64MB (it has been 10MB since the days of 32MB RAM systems).
‘as.data.frame.matrix()’ could return invalid data frame with no ‘row.names’ attribute for 0-row matrix. (Reported by Hervé Pagès.)
Compilation with the ‘vecLib’ or ‘Accelerate’ frameworks on OS X without using that also for LAPACK is more likely to be successful.