Russ, All you have to do is replace
addTA(GSPC.EMA.3, on = 1, col = "#0000ff") with plot(addTA(GSPC.EMA.3, on = 1, col = "#0000ff")) etc. I can sympathize with the documentation frustration, but I think that much of the documentation in R and in many R packages is actually very good. I get much more frustrated with the attempts at 'non-technical' explanations I find in other software. It does take a bit of getting used to always looking at the Value section and, if in doubt, checking some of the See Alsos, but it's worth it. I don't know quantmod very well, but even a cursory look at the pdf file shows that the docs are quite good. As Jeff points out, good documentation is not easy. More good examples are always better, but that's mighty time-consuming. Peter Ehlers On 2011-05-05 10:42, Russ Abbott wrote:
Thanks. You're right. I didn't see that. I read the ?addTA help page, which (annoyingly) didn't mention that feature, but I didn't read the ?TA page. (That page was mentioned as a see also, but not as a must see.) I don't know what it means to wrap these calls in a plot call. I tried to put the addTA calls into a function and call that function from the higher level function, but that didn't work either. Would you tell me what it means to wrap these calls in a plot call. Thanks /-- Russ / P.S. Pardon my irritation, but I continually find that many of the help files assume one already knows the information one is looking for. If you don't know it, the help files are not very helpful. This is a good example. In fact, it's two good examples. I didn't know that I had to look at another page, and I (still) don't know what it means to wrap plot calls in another plot call. On Thu, May 5, 2011 at 3:39 AM, P Ehlers <ehl...@ucalgary.ca <mailto:ehl...@ucalgary.ca>> wrote: On 2011-05-05 0:47, Russ Abbott wrote: Hi, I'm having trouble with quantmod's addTA plotting functions. They seem to work fine when run from the command line. But when run inside a function, only the last one run is visible. Here's an example. test.addTA<- function(from = "2010-06-01") { getSymbols("^GSPC", from = from) GSPC.close<- GSPC[,"GSPC.Close"] GSPC.EMA.3<- EMA(GSPC.close, n=3, ratio=NULL) GSPC.EMA.10<- EMA(GSPC.close, n=10, ratio=NULL) chartSeries(GSPC.close, theme=chartTheme('white'), up.col="black", dn.col="black") addTA(GSPC.EMA.3, on = 1, col = "#0000ff") addTA(GSPC.EMA.10, on = 1, col = "#ff0000") # browser() } When I run this, GSPC.close always appears. But only GSPC.EMA10 appears on the plot along with it. If I switch the order of the addTA calls, only GSPC.EMA3 appears. If I uncomment the call to browser() neither appears when the browser() interrupt occurs. I can then draw both GSPC.EMA.3 and GSPC.EMA10 manually, and let the function terminate. All intended plots are visible after the function terminates. So it isn't as if one wipes out the other. This shows that it's possible to get all three lines on the plot, but I can't figure out how to do it without manual intervention. Any suggestions are appreciated. Perhaps you didn't see this NOTE on the ?TA help page: "Calling any of the above methods from within a function or script will generally require them to be wrapped in a plot call as they rely on the context of the call to initiate the actual charting addition." Peter Ehlers Thanks. *-- Russ * [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org <mailto: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.
______________________________________________ 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.
