R help - Nov 2010 - abline(h=whatever) not working in candleChart() (in quantmod)?

Hello, all--

I am having some fun playing with the graphing in quantmod-- very nice! I am
writing a function to calculate (and hopefully plot) support and resistance
lines, but the usual plot call of "abline(h=value)" does not seem to
work.
Here's my code:

require(quantmod)
AAPL<-getYahooData("AAPL")
candleChart(AAPL,subset="last 3 months",theme="white")
addMACD()
abline(h=290,col="red")


The same sequence works fine if I'm just using a plain vanilla
"plot" call,
however.

What am I missing? Do I need to call the line as a technical study using
addTA? Not sure how to make a straight line constant doing that...

I'm sure it should be obvious, since my searching on google hasn't
turned up
anything. So I'm getting ready for a "face-palm" moment if anyone
can point
me in the right direction!

---------------------------------------
David L. Van Brunt, Ph.D.
mailto:dlvanbrunt@gmail.com


On Sun, Nov 21, 2010 at 10:29 AM, David Winsemius
<dwinsemius@comcast.net>wrote:
> stop() throws an error but the side effect is to pop out of whatever
> environment you may be in and return to the top-level. I thought that was
> what you wanted. If not,  then please produce a better problem description
> with code as requested in the posting guide.
>
>
> On Nov 21, 2010, at 10:12 AM, madr wrote:
>
>
>> I try to use stop(), but i get:
>> Error in eval.with.vis(expr, envir, enclos) :
>> --
>> View this message in context: http://r.789695.n4.nabble.com/
>>
>
> And learn to include context.
>
>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]

On Nov 21, 2010, at 10:50 AM, David L. Van Brunt, Ph.D. wrote:
> Hello, all--
>
> I am having some fun playing with the graphing in quantmod-- very  
> nice! I am
> writing a function to calculate (and hopefully plot) support and  
> resistance
> lines, but the usual plot call of "abline(h=value)" does not seem
to
> work.
> Here's my code:
>
> require(quantmod)
> AAPL<-getYahooData("AAPL")
> candleChart(AAPL,subset="last 3 months",theme="white")
> addMACD()
> abline(h=290,col="red")
Looks to me that chartSeries is an S4 function that works on objects  
of class chob. So try seeing if these widen your perspective :

?"chob-class"
?TA
?newTA
>
>
> The same sequence works fine if I'm just using a plain vanilla  
> "plot" call,
> however.
>
> What am I missing? Do I need to call the line as a technical study  
> using
> addTA?
That's what it looks like from here.
> Not sure how to make a straight line constant doing that...
>
> I'm sure it should be obvious, since my searching on google hasn't
> turned up
> anything. So I'm getting ready for a "face-palm" moment if
anyone
> can point
> me in the right direction!
>
> ---------------------------------------
> David L. Van Brunt, Ph.D.
> mailto:dlvanbrunt at gmail.com
>
trimmed the irrelevant material from another posting
> .
David Winsemius, MD
West Hartford, CT