例.ギャラクシアンのスコア
$ more galaxian_score.csv datetime,score 2017/5/25 20:58,10800 2017/5/25 21:03,5810 2017/5/25 21:08,10660 2017/5/25 21:11,5370 2017/5/26 21:19,8620 2017/5/26 21:30,15560 2017/5/27 0:15,17870 .....
$ R > score<-read.csv("galaxian_score.csv",header=T) > plot(score$score~as.POSIXct(score$datetime))
pngで保存
> png("glsc20170527-20170723.png") > plot(score$score~as.POSIXct(score$datetime)) > dev.off()
https://stat.ethz.ch/R-manual/R-devel/library/grDevices/html/png.html