On Fri, 14 Oct 2016, David Winsemius wrote:

rain <- source("~/raindata.dat")
List of 2
$ value  :'data.frame': 341 obs. of  3 variables:
 ..$ station: Factor w/ 6 levels "0.3E","0.6W",..: 1 1 1 1 1 1 1 1 1 1 ...
 ..$ date   : Factor w/ 62 levels "2013-12-01","2013-12-02",..: 32 33 34 35 36 
37 38 39 40 41 ...
 ..$ amount : Factor w/ 48 levels "","0.00","0.01",..: 1 1 3 2 2 2 12 18 34 14 
$ visible: logi TRUE


  I left the station as a factor and changed the date using
as.Date(as.character...) and the amount using as.numeric.

When you do that you can see the only the first item in the length2 list
is likely to be useful:

  I'm not seeing to what the 'List of 2' refers in the data.frame.

  This is the script I sourced:

rain <- read.csv("daily_records.csv", header=T, sep=",")
rain$date <- as.Date(as.character(rain$date))
rain$amount <- as.numeric(rain$amount)
xyplot(rain$amount ~ rain$date | rain$station, main="Weather Stations", xlab="Date", 
ylab="Amount (inches)", pch=20, col=132)

  What did I do incorrectly here?

And the date column is a factor. Fortunately the as.Date.factor function
doesn't need as.chaacter anymore:

  Oh. Thanks.

The place on the ?xyplot help page to look is in the section on `scales`.
There's no difficulty using 'rot' as long as it is in the correct place
which in this instance is `x` sublist of the `scales` list

xyplot(amount ~ date | station, data=rain, main="Weather Stations",
   xlab="Date", ylab="Amount (inches)", pch=16, col=132,
               x=list(at=seq(min(rain$date), max(rain$date), by='week'), 
rot=90) )

  That's what I missed: where the scales command is placed, and
understanding how to use all the components.

  I need to figure out why I'm no longer seeing the help files. As far as I
know they should be loaded when I invoke R.

Thanks very much,


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