The #'s were a quick solution to stop WinEdt reformatting my code automatically, now I discovered I can switch to a different wrap mode.
This is the code just now:
>
> psDateTime <- function(DateTime, FileName){
+ strFileName <- paste("Analysis\\Graphics\\time_date_", FileName, sep = "")
+ startMonth <- as.POSIXct(as.Date("01/09/2003", format="%d/%m/%Y"))
+ endMonth <- as.POSIXct(as.Date("01/06/2004", format="%d/%m/%Y"))
+ startTime <- as.POSIXct(as.Date("00:00:00", format="%H:%m:%s"))
+ endTime <- as.POSIXct(as.Date("23:59:59", format="%H:%m:%s"))
+ Date <- trunc(DateTime, "day")
+ Time <- DateTime - Date
+ postscript(strFileName)
+ plot(x=Date, y=Time,
+ xlab= "Date (month/year)", ylab= "Time (hours)", xaxt="n", #yaxt="n",
+ xlim=c(as.POSIXct(startMonth), as.POSIXct(endMonth)),
+ ylim=c(as.POSIXct(startTime), as.POSIXct(endTime))
+ )
+ axis.POSIXct(1, at=seq(startMonth, endMonth, by="month"), format="%m/%y")
+ axis.POSIXct(2, at=seq(startTime, endTime, by="hours"), format="%H")
+ pstamp(pwd=FALSE, time=TRUE)
+ dev.off()
+ }
> psDateTime(datKruger1$DaTim, "datKruger1.eps")
Error in plot.window(xlim, ylim, log, asp, ...) :
need finite ylim values
>
and when removing the ylim line from the above code, an error associated with the 'axis.POSICct(2....)' line:
> psDateTime(datKruger1$DaTim, "datKruger1.eps")
Error in if (to <= from) stop("`to' must be later than `from'") :
missing value where TRUE/FALSE needed
>Any help much appreciated,
Sander.
At 15:58 2004/05/17, you wrote:
On Mon, 17 May 2004, Slist wrote:
> I have a data set containing GPS fixes of animal locations. To check that
> the GPS's are working properly, I would like to plot the time of the fixes
> (y-axis) against the date of the fixes (x-axis). If all works well, the
> plot should show four regular fixes per day. The x-axis should be labelled
> with month/year (i.e. 11/04) and the y-axis by hour from 00 to 24. I would
> like to control the x-axis limits.
>
> I have looked at several date and time related help pages, but get horribly
> lost in all the terminology. The main challenge is to isolate date and time
> from the date/time object for plotting (marked ???). Therefore, I would
> like the following example code to work:
>
> >
> >
> dates <- c("02/27/92", "02/27/92", "01/14/92", "01/14/92", "03/28/92", "03/28/92") #
> times <- c("23:03:20", "10:29:56", "01:03:30", "13:03:30", "18:21:03", "06:56:26") #
> x <- paste(dates, times) #
> DateTime <- strptime(x, "%m/%d/%y %H:%M:%S") #
Why do you end lines with #? It is rather confusing.
Date <- trunc(DateTime, "day") Time <- DateTime - Date plot(Date, Time)
appears to do what you want (except the x axis labelling, which you can alter by a call to axis.POSIXct and x-axis limits, which need to be set via xlim as a POSIXct object.).
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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