[R] Plot.ts

[Gavin Simpson]

Dear list,

I have a time series of 2-hourly temperature data from loggers placed in
two lakes.  I have created an object of class ts and mts (temp.ts) using
the ts() function and have managed to set the start position and the
frequency to 2-hours.

I now what to produce a plot of these two time series, and the default
provided by plot.ts() gives a nice plot of the data for the two lakes in
two separate panels using the option plot.type="multiple" in plot.ts().
I would like to alter the plot a little:

1) Change the x and y-axis labels, but when I set ylab="" in my call to
plot.ts() I get the following message:

>plot.ts(temp.ts, ylab="")
Error in plot.ts(x[, i], axes = FALSE, xlab = "", ylab = "", log = log,
: 
        formal argument "ylab" matched by multiple actual arguments

2) I get the same when I try to not plot the axes:

>plot(temp.ts, cex=0.75, axes=FALSE)
Error in plot.ts(x[, i], axes = FALSE, xlab = "", ylab = "", log = log,
: 
        formal argument "axes" matched by multiple actual arguments

3) I want to change the default labels for the tick marks that the plot
has ("2000", "2000.5", "2001", "2001.5") to just show the change of
year, i.e. indicate where 2001 and 2002 start.  But because I do not see
how to go about not plotting the axes I am a little stuck.

Can someone point me in the right direction as to how I can set my own
y-axis labels for a multiple times series plot, even just setting them
to "" would be good as I can just use mtext() to add a label for the
whole plot, and how to specify my own, or control the, labelling of the
tick marks on the x-axis?

Many thanks

Gavin Simpson

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Gavin Simpson                     [T] +44 (0)20 7679 5522
ENSIS Research Fellow             [F] +44 (0)20 7679 7565
ENSIS Ltd. & ECRC                 [E] gavin.simpson at ucl.ac.uk
UCL Department of Geography       [W] http://www.ucl.ac.uk/~ucfagls/cv/
26 Bedford Way                    [W] http://www.ucl.ac.uk/~ucfagls/
London.  WC1H 0AP.
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