Rの説明
2+2
## [1] 4
2-2
## [1] 0
2*2
2/2
## [1] 1
2^2
library(readr) trade2013 <- read_csv("trade2013.csv")
plot(trade2013$lgdp1,trade2013$ltrade,xlab="GDP",ylab = "貿易額")