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gc()
          used (Mb) gc trigger (Mb) max used (Mb)
Ncells  806834 43.1    1442291 77.1  1168576 62.5
Vcells 1477471 11.3    4094790 31.3  3704075 28.3



A call of gc causes a garbage collection to take place. This will also take place automatically without user intervention, and the primary purpose of calling gc is for the report on memory usage.