[R] Formatting POSIXt values in plot axis labels

[Ronnen Levinson]

Hello.

I have an XYY series that I would like to graph with matplot() or some
other single function that will do the trick.
The X in question is a vector of POSIXt values obtained from strptime().

Is it possible to tell matplot() how to handle POSIXt x values?

I have examined the examples at
http://lark.cc.ukans.edu/~pauljohn/R/statsRus.html#5.22 , but would
prefer not have to overlay the results of multiple plot() calls.

Example:

a=strptime("06/01/2002 12:00:00","%m/%d/%Y %H:%M:%S")
x=seq(a,a+10*24*3600,length=3)
y=seq(1,4)
plot(x,y)
matplot(x,cbind(y,y))

I have also noticed that plot() seems to make judgement calls as to how
to present POSIXt values. For example,

a=strptime("06/01/2002 12:00:00","%m/%d/%Y %H:%M:%S")
x=seq(a,a+3*24*3600,length=3)
y=seq(1,4)
plot(x,y)

shows days of week. Is there a way for me to give plot() and/or
matplot() formatting instructions for POSIXt values?

Thanks,

Ronnen.

R1.5.1 on Windows 98

--
Ronnen Levinson, Ph.D.            \/      RML27 at cornell.edu
scientist                         ||      http://ronnen.com
Lawrence Berkeley National Lab    /\      fax 425.955.1992

======================================
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dresses displaying
various grades of abdomen, moved in and out of California Spanish shops
and office buildings.
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mountains were there,
making them all look silly.

-- Ross Macdonald, "The Moving Target"
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