1.6 KiB
1.6 KiB
Datatable package
Org document with R code
rm(list = ls())
Querying data.table
Sintaxis:
DT[i, j, by]
Subseting by "i" and "j"
Subset rows in "i"
dt1 <- flights[origin == "JFK" & month == 6L]
dt1
Get the first two rows
flights[1:2]
year month day dep_delay arr_delay carrier origin dest air_time distance 1: 2014 1 1 14 13 AA JFK LAX 359 2475 2: 2014 1 1 -3 13 AA JFK LAX 363 2475 hour 1: 9 2: 11
Ordering results of querying
dt_filt <- flights[order(origin, -dest)]
dt_filt