On 06/02/2009 4:48 PM, Paul Warren Simonin wrote:
Hello,
I am attempting to create plots using two continuous variables and
it seems I should be able to use the simple "plot" command. However,
my x-axis values are dates, and I believe this could be the reason I
am receiving error messages reading:
Error in Summary.factor(c(2L, 4L, 3L, 5L, 6L, 7L, 1L), na.rm = FALSE) :
range not meaningful for factors
I have attempted to convert the date values to official dates within R
and have done that successfully using the as.date function, but this
did not help in the plots. So, how can one create plots in which the
x-axis is date values? I know it would be possible to convert all my
dates into a different linear scale (e.g., julian dates). However, I
would like to complete this process as simply as possible.
You can do plots using dates on the axis, e.g.
dates <- ISOdate(2009, 1:12, 1) # first of every month
plot(dates, 1:12)
Now sometimes the default tick choices for dates don't look great, e.g.
plot(dates[1:3], 1:3)
only gets two ticks labelled Jan and Mar, but you can specify your own
locations and labels:
plot(dates[1:3], 1:3, xaxt="n")
axis(1, at=dates[1:3], labels=format(dates[1:3], "%b %d"))
Duncan Murdoch
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