[R] Generating axes with "Sun Apr 20 22:45:27 PDT 2003" timecoordinates.

[Uwe Ligges]

John Jaynes wrote:
> 
> Good Morning!
> 
> My apologies for what may be considered an infantile question: I have data
> that I would like to plot, positive integers for the y-axis, and time
> coordinates of the "Sun Apr 20 22:45:27 PDT 2003" format for the x-axis.
> I have tried:
> 
> x1 <- 1050352610
> x2 <- 1050352999
> x3 <- 1050858319
> class(x1) <- "POSIXct"
> class(x2) <- "POSIXct"
> class(x3) <- "POSIXct"
> X <- c(x1, x2, x3)
> ...
> ...
> plot(X, Y, type = "l")
> 
> I end up with "Mon", "Tues", "Wed", ... x-axis coordinates, when I need
> "2003-04-14 13:36:50 PDT",  "2003-04-14 13:43:19 PDT"
> and  "2003-04-20 10:05:19 PDT" x-axis coordinates. I adjusted the data to be
> one second apart and ended up with integer "19", "20", ... x-axis
> coordinates. What do I need to do to accomplish this? Any help will be
> greatly appreciated, as I have looked at the help pages, and the web, to no
> avail. I would also be more than happy to purchase a book that contains
> information to this level of detail if that is available.
> 
> Thank You,
> 
> John Jaynes


I guess you are looking for:

  plot(X, Y, type = "l", xaxt = "n")
  axis.POSIXct(1, X, at=X, format="%a %b %d %H:%M:%S %Z %Y")

Uwe Ligges