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並前往https://www.wyzant.com/resources/answers/719824/how-to-get-a-vertical-geom-vline-to-an-x-axis-of-class-date

How to get a vertical geom_vline to an x-axis of class date?

... google group on `POSIXct` and `geom_vline`, I could not get it done. ... gg + geom_vline(xintercept=mydata$datefield[120],linetype=4) ...

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