[R] lines and dates
Toby.Patterson at csiro.au
Thu Feb 5 04:17:47 CET 2004
As per the stuff on the list earlier, it looks like you probably need to
convert the POSIXlt's to POSIXct's
From: Jean Eid [mailto:jeaneid at chass.utoronto.ca]
Sent: Thursday, February 05, 2004 11:39 AM
To: r-help at stat.math.ethz.ch
Subject: [R] lines and dates
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$Model), function(x) lines(x[, "date"], x[,
I get an error:
Error in xy.coords(x, y) : x and y lengths differ
I believe that it has something to do with POSIXlt. when I issue a
length or NROW command on temp$date it returns the value 9.
any help is greatly appreciated,
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