[R-SIG-Finance] abline for quantmod charts

[Hae Kyung Im]

Hi Jeff

I had to change the argument "on" to 1 for it to show the vertical
line (I have quantmod 0.3-8)
addTA(xts(TRUE,as.Date("2008-04-01")),on=1,col="#333333")


Now I wanted to make it easier to call including the call to a function:

addVLine = function(dtlist)
  {
    addTA(xts( rep(TRUE, NROW(dtlist)), dtlist), on=1, col="#333333")
  }

where dtlist is a vector with datetime type. But when the lines don't
show up. It does plot the vertical lines when I run the command
directly but not within the function. This is what I get on the
command line:

> addVLine(index(data.xmin)[te])
<chobTA object: addTA>


Do you know how to solve this?

Thanks
Haky




On Thu, Apr 30, 2009 at 4:16 PM, Jeff Ryan <jeff.a.ryan at gmail.com> wrote:
> Hi Hae,
>
> The best way to do this at the moment is with addTA:
>
> chartSeries(YHOO)
> addTA(xts(TRUE,as.Date("2008-04-01")),on=-(1:2),col="#333333")
>
> zoomChart('200803/200804')
>
> 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
> want.
>
>
> HTH,
> Jeff
>
> 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
> www.insightalgo.com
>