[R-SIG-Finance] abline for quantmod charts

Jeff Ryan jeff.a.ryan at gmail.com
Thu Apr 30 23:16:48 CEST 2009

Hi Hae,

The best way to do this at the moment is with addTA:



You'll notice that it draws a thick line (region).  This is usually
more useful than just a line on quantmod charts, as the spacing is
between observations is padded.

I will at some point be adding access for primitive graphics function
to the whole charting process, but for now this should do what you


On Thu, Apr 30, 2009 at 3:56 PM, Hae Kyung Im <haky.im at gmail.com> wrote:
> Hi,
> I was trying to add vertical lines to a quantmod plot using
> abline( v = somdatetime ) like in the following example
>> getSymbols("YHOO")
> [1] "YHOO"
>> chartSeries(YHOO)
>> abline( v=as.POSIXct("2008-04-01","%Y-%m-%d") )
> But nothing shows up on the chart.
> Any ideas on how to do this?
> Thanks
> Haky
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Jeffrey Ryan
jeffrey.ryan at insightalgo.com

ia: insight algorithmics

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