Wow!! Thank you so much for your suggestions! For now, A.K's suggestion #1
is perfect for me!
Thank you very much!
Best,
Charles
On Thu, Oct 17, 2013 at 2:34 AM, William Dunlap <wdun...@tibco.com> wrote:
> You could bump up the day each time an hour was less than the previous
> one. E.g.,
> testtime <-
> c("20:00:00","22:10:00","22:20:00","23:15:00","23:43:00","00:00:00","00:51:00","01:00:00")
> var <- seq_along(testtime) # so you know what the plot should look like
> # turn it ino a POSIXlt object so you can do arithmetic on it
> t <- strptime(testtime,format="%H:%M:%S")
> # now add a day each time t[i]<t[i-1]
> td <- t + .difftime(cumsum(c(FALSE, diff(t)<0)), units="days")
> # compare plots
> par(mfrow=c(2,1))
> plot(t,var,type="b",xlab="Time",ylab="Var")
> plot(td,var,type="b",xlab="Time",ylab="Var")
> This is dicey because you may have skipped more than one day.
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>
> > -----Original Message-----
> > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf
> > Of Law, Jason
> > Sent: Wednesday, October 16, 2013 5:04 PM
> > To: Charles Novaes de Santana; r-help@r-project.org
> > Subject: Re: [R] Plot time series data irregularly hourly-spaced
> >
> > You just need the date, otherwise how would it know what time comes
> first? In
> > strptime(), a date is being assumed.
> >
> > Try this:
> >
> > testtime<-
> >
> c("20:00:00","22:10:00","22:20:00","23:15:00","23:43:00","00:00:00","00:51:00","01:00:
> > 00")
> > testday <- rep(Sys.Date() - c(1,0), times = c(5,3))
> > plot(as.POSIXct(paste(testday, testtime)), var)
> >
> > Jason
> >
> > -----Original Message-----
> > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf
> > Of Charles Novaes de Santana
> > Sent: Wednesday, October 16, 2013 2:58 PM
> > To: r-help@r-project.org
> > Subject: [R] Plot time series data irregularly hourly-spaced
> >
> > Dear all,
> >
> > I have a time series of data that I would like to represent in a plot.
> But I am facing some
> > problems to do it because the time is represented in "hours", it can
> start in one day and
> > end in another day, and it is not regularly spaced.
> >
> > My problem is that when I plot my data, my X-axis always starts from the
> lower values of
> > my time data. For example, I would like to plot data that starts at
> 20:00:00 and ends at
> > 01:00:00, but R considers that 01:00:00 is lower than 21:00:00 and my
> plot is kind of
> > "crossed over time".
> >
> > Please try this example to see it graphically:
> >
> > testtime<-
> >
> c("20:00:00","22:10:00","22:20:00","23:15:00","23:43:00","00:00:00","00:51:00","01:00:
> > 00")
> > var<-runif(length(testtime),0,1)
> >
> plot(strptime(testtime,format="%H:%M:%S"),var,type="b",xlab="Time",ylab="Var")
> >
> > In this case, I would like to have a plot that starts at 20:00:00 and
> ends at 01:00:00.
> >
> > Does anybody know how to make R understand that 00:00:00 comes after
> 20:00:00 in
> > this case? Or at least does anybody know a tip to make a plot with this
> kind of X-axis?
> >
> > Thanks for your time and thanks in advance for any help.
> >
> > Best regards,
> >
> > Charles
> > --
> > Um axé! :)
> >
> > --
> > Charles Novaes de Santana, PhD
> > http://www.imedea.uib-csic.es/~charles
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
--
Um axé! :)
--
Charles Novaes de Santana, PhD
http://www.imedea.uib-csic.es/~charles
[[alternative HTML version deleted]]
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