아래의 예는 ggplot2() 패키지와 ggmap 을 활용하는 방법을 보여주고 있으며 원문은http://freesearch.pe.kr/archives/3953 입니다. > rm(list=ls())> install.packages("doParallel")Installing package into ‘C:/Users/stu/Documents/R/win-library/3.0’(as ‘lib’ is unspecified)trying URL 'http://cran.nexr.com/bin/windows/contrib/3.0/doParallel_1.0.7.zip'Content type 'application/zip' length 184085 bytes (179 Kb)opened URLdownloaded 179 Kb p..