abline for quantmod charts

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

--
Jeffrey Ryan
jeffrey.ryan at insightalgo.com

ia: insight algorithmics
www.insightalgo.com