r - Lattice, xyplot, 2 time series on same graph (overlay) -

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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)

time series plots superposed

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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