R language reading Big data data.table packet fread function

> setwd ("D:\\r_tardy") > Library (data.table)//data.table 1.9.6//For help type? data.table or//HTTPS://GITHUB.C Om/rdatatable/data.table/wikithe fastest Learn (by data.table authors)://https://www.datacamp.com/courses/ Data-analysis-the-data-table-way> testdt <-fread ("test.txt", Sep = "\ t", Header = FALSE, na.strings = "NA")//before viewing the file A few lines > head (TESTDT)//Rename column name > colnames (TESTDT) <-C ("ID", "num", "desc") > Head (TESTDT) > DF <-testdt[tes Tdt$desc%in% C ("Heat Group"), 1:ncol (TESTDT), with=false]> df1 <-data.frame (DF) > Nrow (DF1)

R language reading Big data data.table packet fread function