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並前往https://www.r-bloggers.com/2015/11/scaling-data-table-using-index-2/

Scaling data.table using index | R-bloggers

datatable.auto.index=TRUE). dt = data.table(a=letters[c(3L,1L,2L)]). set2keyv(dt, "a"). ## forder took 0 sec. attr(dt, "index").

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