Plot with x-axis dates
On Sat, Feb 7, 2009 at 6:10 AM, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
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)
I would be a bit careful here since there could be some misalignment due to GMT vs. current time zone depending on what you have. See R News 4/1 for more.