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並前往https://www.machinelearningplus.com/data-manipulation/datatable-in-r-complete-guide/

data.table in R - The Complete Beginners Guide - Machine ...

setDF(mtcars_copy) class(mtcars_copy) #> [1] "data.frame" ... Create column named 'var1' # Syntax 1 mtcars_dt[, c(myvar):=1] # Syntax 2 ...

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