[R] Formatting POSIXt values in plot axis labels

Jason Turner jasont at indigoindustrial.co.nz
Mon Aug 5 22:32:15 CEST 2002

On Mon, Aug 05, 2002 at 02:23:07PM -0700, Ronnen Levinson wrote:
> 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 there a way for me to give plot() and/or
> matplot() formatting instructions for POSIXt values?

Yup.  In two steps...

1) plot, but without a labeled x-axis (x.stuff should have 
class "POSIXct"):

matplot(x.stuff, y.stuff, xaxt="n")

2) you can now use axis.POSIXct()
And a very nice function it is.  You can tell it where to put
the ticks (if you don't find the defaults appropriate), and what
format to display the dates.


Indigo Industrial Controls Ltd.
jasont at indigoindustrial.co.nz
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