[R] abline with zoo series

[Jim Lemon]

Hi Erin,
I would look at:

par("usr")

to see what the range of the abscissa might be.

Jim


On Fri, Nov 25, 2016 at 2:03 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
> Hello!  Happy Thanksgiving to those who are celebrating.
>
> I have a zoo series that I am plotting, and I would like to have some
> vertical lines at certain points, to indicate US business cycles.  Here is
> an example:
>
> app1 <- get.hist.quote(instrument="appl",
> start="1985-01-01",end="2016-08-31", quote="AdjClose", compression="m")
> #Fine
> plot(app1,main="Historical Stock Prices: Apple Corporation")
> #Still Fine
> #Now I want to use abline at July 1990 and March 1991 (as a start) for
> business cycles.  I tried v=67 and v="1990-07", no good.
>
> I have a feeling that it's really simple and I'm just not seeing it.
>
> Any help much appreciated.
>
> Thanks,
> Erin
>
>
> --
> Erin Hodgess
> Associate Professor
> Department of Mathematical and Statistics
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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>
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