Dear All,
I have the following data.frame
`data.frame': 1563 obs. of 4 variables:
$ Model :Class 'AsIs' chr [1:40] "Astro" "Astro" "Astro" "Astro"
$ Make :Class 'AsIs' chr [1:40] "Chevrolet" "Chevrolet"
$ Production : num 11219 12384 1082 5409 5458 ...
$ date :`POSIXlt', format: chr "2000-05-01" "2000-06-01"
The data frame contains production levels of some cars from 2000 to 2003.
My question is about plotting production for each model.
I have a code that outputs a plot for each model and
it works fine. However I would like to plot couple of models together i.e
when I do
plot(temp$date, temp$Production, type="n")
by(temp, list(temp$Model), function(x) lines(x[, "date"], x[,
"Production"]))
I get an error:
Error in xy.coords(x, y) : x and y lengths differ
I believe that it has something to do with POSIXlt. when I issue a length
or NROW command on temp$date it returns the value 9.
any help is greatly appreciated,
Jean
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