r - Lattice, xyplot, 2 time series on same graph (overlay) -
i want plot 2 time series on same graph, using xyplot.
here example of mean using ts.plot()
a1 = ts(rnorm(20), start=c(1980,1), freq=4) a2 = a1+3 ts.plot(a1,a2) i have tried
xyplot(merge(a1,a2))
which returns error, , have tried
xyplot(merge(as.xts(a1),as.xts(a2))) which plots them in different panels, not on same panel.
you can combine 2 time series objects using cbind (or, alternatively, ts.union). set superpose argument in xyplot true:
xyplot(cbind(a1, a2), superpose = true) 
short clarification: there s3 method xyplot handles ts (time series) objects. method (xyplot.ts) gets called when x argument xyplot time series object.
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