R help - Apr 2003 - Generating axes with "Sun Apr 20 22:45:27 PDT 2003" time coordinates.

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

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