Rでx軸に日付をプロットする

https://books.google.co.jp/books?id=KnTZDQAAQBAJ&pg=PA503&lpg=PA503&dq=read+csv+plot+date+r&source=bl&ots=d6W14WpOdZ&sig=dhtRUldU8RugbVN-NmGyKVWXq8c&hl=ja&sa=X&ved=0ahUKEwiaqJuiz87VAhUCn5QKHS4qCbQ4ChDoAQhGMAY#v=onepage&q=read%20csv%20plot%20date%20r&f=false


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