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> setwd("D:\\R_Tardy")> library(data.table)// data.table 1.9.6 // For help type ? data.table or //wwwhttps://github.com/Rdatatable/data.table/wikiThe fastest way to learn (by data.table authors): //https://www.datacamp.com/courses/data-analysis-the-data-table-way> TestDT head(TestDT)//names of heavy name columns> colnames(TestDT) head(TestDT)> df df1 nrow(df1)

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