Hi, I am trying to add a rectangular colored background area to a plot of a time series of relative price changes. I believe that what I'm trying to do is very similar to the question and example given here:
http://www.mail-archive.com/r-h...@stat.math.ethz.ch/msg73948.html http://www.mayin.org/ajayshah/KB/R/html/g5.html My problem/difference is that my time series looks like so: > library(quantmod) > getSymbols("^GSPC", from="2008-01-01") > xtsPR <- diff(log(Ad(GSPC))) > head(xtsPR) GSPC.Adjusted 2008-01-02 NA 2008-01-03 0.000000000 2008-01-04 -0.024857950 2008-01-07 0.003218041 2008-01-08 -0.018522677 2008-01-09 0.013532064 So my dates along the x-axis are in the format "2008-01-02" rather than "2008", as in the example. To keep things simple, I've simply been trying to plot the time series using the plot command: plot(xtsPR) and then adding either a polygon, or preferably, a rect: rect(2009-01-02, -0.10, 2009-12-31, 0.10, border = 0, col = "blue") But nothing is added to the plot when I try to add the rectangle, but I don't get an error message either. My question is how do I specify my x coordinates to draw the polygon or rect, given that my scale is of the form "2008-01-02" rather than simply "2008"? Additionally, do I have to use polygon, even if I'm trying to drawing a rectangle, as was the case in the examples linked above? I'd like to be able to use this with chartSeries, rather than plot, but I thought it would be easiest to figure it out using plot first. Clearly that hasn't helped me. Thanks for any advice you can provide. James ______________________________________________ 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.
