On Wed, Feb 27, 2013 at 8:06 AM, Ben Neal <bn...@spg.ucsd.edu> wrote: > I would like to plot multiple zoo object lines on one plot. These are time > series of temperatures derived from different sampling regimes (one is > sub-hourly, and the other is bi-weekly). I understand that they need to be > indexed in the same way to be plotted together, and so took my two zoo > objects (Named DataNOAAZOO and NightTemps20m and transformed into similar > daily means with this code: > > DailyNightTemps_20m = aggregate(NightTemps_20m, > as.Date(time(NightTemps_20m)), mean) > DailyNightTemps_NOAA = aggregate(DataNOAAZOO$SST, as.Date(time(DataNOAAZOO)), > mean) > > One object now has ~4000 entries and the other ~1000 (one is every day and > the other bi-weekly) but they are now on the same daily index (at least I > believe they are, from my reading). Therefor I think they should plot > together with this code: > > plot(DailyNightTemps_20m) > lines (DailyNightTemps_NOAA, col = "red") > > (This is directly from the zoo instructions, which state: > ## univariate plotting > x <- zoo(rnorm(5), x.Date) > x2 <- zoo(rnorm(5, sd = 0.2), x.Date) > plot(x) > lines(x2, col = 2) ) > > But the second one does not show up at all and I get no error message. > > I will be doing a similar operation with Monthly and Annual Means, and also > similar plots with other parameters in the zoo (derived differences), so I > want so solve this issue before moving on to the other variables. I did some > reading before posting and tried various solutions, but I still cannot figure > out why the basic instructions above do not work. > > I know this is a basic question, with a probably obvious answer, but it kept > me up all night so thanks for any assistance. Ben Neal
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