Exercise 1

  1. Load the ff package r library("ff")
  2. Create a dummy csv file and compare the read times of read.csv.ffdf and read.csv
ffx = read.csv.ffdf(file=filename, header=TRUE)
dd = read.csv(file=filename, header=TRUE)

Solutions

dd = matrix(rnorm(1e5), ncol=100)
write.csv(dd, "/tmp/tmp.csv")
library("ff")
system.time(read.csv.ffdf(file="/tmp/tmp.csv", header=TRUE))
system.time(read.csv(file="/tmp/tmp.csv", header=TRUE))


jr-packages/jrBig documentation built on April 3, 2018, 6:57 a.m.