On Aug 31, 2011, at 12:06 PM, Peter Maclean wrote:
Hi:
Trying for hours to add a legend to a periodogram. Any help will be
appreciated.
For example, how can I add a legent (showing x1, x2, x3, x4) to both
plots (generated by spec.program() and plot()? Here is a worked
example.
require(TSA)
require(graphics)
require(stats)
t<-1986:2011
x1<-cos(t*1990/2011)
x2<-cos(t*2000/20011)
x3<-sin(t*1990/2011)
x4<-sin(t*2000/2011)
y<-cbind(t,x1,x2, x3,x4)
y.time = ts(y.time, start=1986, frequency=1)
y.spc<-spec.pgram(y.time, spans = c(3,3),
detrend=FALSE,log="no",plot = TRUE, kernel("modified.daniell",
c(5,7)))
plot(y.spc, plot.type = "marginal", main="Smoothed Periodogram")
The code throws an error. Perhaps you meant:
y.time = ts(y[ ,"t"], start=1986, frequency=1)
At any rate the answer to the question is probably:
class(y.spc) # class "spec"
?methods(plot) # the spec method is not hidden
plot.spec # uses base graphics ..... so
?legend
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______________________________________________
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