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add_mac
2010 Nov 21
1
abline(h=whatever) not working in candleChart() (in quantmod)?
...ion 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 shou...