data.table: fread

Pengantar Mengimpor Data di R

Filip Schouwenaars

Instructor, DataCamp

data.table

Matt Dowle & Arun Srinivasan
Metrik utama: kecepatan
Manipulasi data di R
Fungsi impor data: fread()

install.packages("data.table")
library(data.table)

Mirip dengan read.table()

fread()

states.csv

state,capital,pop_mill,area_sqm
South Dakota,Pierre,0.853,77116
New York,Albany,19.746,54555
Oregon,Salem,3.970,98381
Vermont,Montpelier,0.627,9616
Hawaii,Honolulu,1.420,10931

states2.csv

South Dakota,Pierre,0.853,77116
New York,Albany,19.746,54555
Oregon,Salem,3.970,98381
Vermont,Montpelier,0.627,9616
Hawaii,Honolulu,1.420,10931

fread()

fread("states.csv")

          state    capital pop_mill area_sqm
1: South Dakota     Pierre    0.853    77116
2:     New York     Albany   19.746    54555
3:       Oregon      Salem    3.970    98381
4:      Vermont Montpelier    0.627     9616
5:       Hawaii   Honolulu    1.420    10931

fread("states2.csv")

             V1         V2     V3    V4
1: South Dakota     Pierre  0.853 77116
2:     New York     Albany 19.746 54555
3:       Oregon      Salem  3.970 98381
4:      Vermont Montpelier  0.627  9616
5:       Hawaii   Honolulu  1.420 10931

fread()

Menebak tipe kolom dan pemisah
Langsung berfungsi
Sangat cepat
Banyak parameter dapat diatur
Versi read.table() yang lebih baik
Cepat, praktis, dapat dikustomisasi

Ayo berlatih!

Pengantar Mengimpor Data di R