[R] abline with zoo series

[David Winsemius]

> On Nov 24, 2016, at 7:03 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:
> 

library(tseries)
> app1 <- get.hist.quote(instrument="aapl",  # note correction
> 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.

#Try this:

abline( v= as.Date("1990-07-01") )

The x-axis is being created using the Date class values and formatting.


> 
> 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
> 
> 	[[alternative HTML version deleted]]

Sigh.

> 
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David Winsemius
Alameda, CA, USA