I can't add Date layer when use ggplot2

Asked Aug 30 '16 at 06:27

Active Aug 30 '16 at 07:44

Viewed 58 times

library(ggplot2)
p <- qplot(date, unemploy, data = economics, geom = "line", xlab = "",
           ylab = "No. of unemployed(1000s)")
presidential <- presidential[-(1 : 3), ]
p + geom_vline(aes(xintercept = start) , data = presidential)

I want to do the plot like above. But I got an error,

Error in Ops.Date((x - from[1]), diff(from))

In Hadley Wickham's book ggplot2, the above code is ok. I have also viewed questions like mine. One solution is to use numeric form of date, but if I use numeric form, the x-axis would be numeric number not date. Could anyone help me figure out how to solve this problem? Thank you!

edited Aug 30 '16 at 07:44

asked Aug 30 '16 at 06:27

lacfo

1

where are you getting ``a`` from? Also, to be clear, the error is only produced after ``+ geom_vline(xintercept = a, data = presidential)`` and not after define ``p`` on your second line? – Cyrus Mohammadian Aug 30 '16 at 06:33
Code works for me (except that `a` is not found). Are you using the current version of R? Maybe restart. – Richard Telford Aug 30 '16 at 07:14
1

I am sorry I have re-edited the code. – lacfo Aug 30 '16 at 07:45
I could plot a vertical line when I just use `intercept = as.numeric(as.Date(1970-02-03))`, but it does not work when `aes(intercept = as.numeric(start))` – lacfo Aug 30 '16 at 08:14
`aes(xintercept = as.numeric(start))` works on my end.. – Axeman Aug 30 '16 at 08:25
@Axeman Yeah it worked on my end as well after I restart R. – lacfo Aug 31 '16 at 01:17
Thank very much all of you! – lacfo Aug 31 '16 at 01:17

I can't add Date layer when use ggplot2

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