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On Wed, Dec 31, 2008 at 2:20 PM, Graves, Gregory <ggra...@sfwmd.gov> wrote: > Newbie here~ > > I've spent a ton of time on this, but have to admit I am stuck. I've tried > various combinations of strptime and the package CHRON, but still can't get > there. > > My simple task is that I want to plot salinity (S1 or S2) on y-axis and time > on x-axis, but I want to use a lay-understandable representation of time (not > Julian). If I use the following command, I can make a plot using > "plot(S1~sdate)", where: > > sdate<-as.POSIXct(strptime(date,format="%m/%d/%Y %H:%M")) > > ... however, every 00:00 time winds up being an NA. Here is an excerpt of > the input data (this is a HUGE file): > > index Date Julian S1 S2 > 24985 11/19/2006 00:00 39040.01 20.40 22.11 (this line winds up being > an NA) > 24986 11/19/2006 01:00 39040.05 20.42 22.22 > 24987 11/19/2006 02:00 39040.09 20.60 22.29 > 24988 11/19/2006 03:00 39040.14 20.62 22.21 > 24989 11/19/2006 04:00 39040.18 20.75 22.39 > > ... an excerpt of the variable "sdate" winds up looking like this: > > [35017] NA "2007-09-08 01:00:00 EDT" > [35019] "2007-09-08 01:00:00 EDT" "2007-09-08 10:00:00 EDT" > [35021] "2007-09-08 10:00:00 EDT" "2007-09-08 11:00:00 EDT" > [35023] "2007-09-08 11:00:00 EDT" "2007-09-08 12:00:00 EDT" > [35025] "2007-09-08 02:00:00 EDT" "2007-09-08 02:00:00 EDT" > [35027] "2007-09-08 03:00:00 EDT" "2007-09-08 03:00:00 EDT" > [35029] "2007-09-08 04:00:00 EDT" "2007-09-08 04:00:00 EDT" > [35031] "2007-09-08 05:00:00 EDT" "2007-09-08 05:00:00 EDT" > [35033] "2007-09-08 06:00:00 EDT" "2007-09-08 06:00:00 EDT" > [35035] "2007-09-08 07:00:00 EDT" "2007-09-08 07:00:00 EDT" > [35037] "2007-09-08 08:00:00 EDT" "2007-09-08 08:00:00 EDT" > [35039] "2007-09-08 09:00:00 EDT" "2007-09-08 09:00:00 EDT" > [35041] NA "2007-09-09 01:00:00 EDT" > [35043] "2007-09-09 01:00:00 EDT" "2007-09-09 10:00:00 EDT" > [35045] "2007-09-09 10:00:00 EDT" "2007-09-09 11:00:00 EDT" > [35047] "2007-09-09 11:00:00 EDT" "2007-09-09 12:00:00 EDT" > [35049] "2007-09-09 02:00:00 EDT" "2007-09-09 02:00:00 EDT" > [35051] "2007-09-09 03:00:00 EDT" "2007-09-09 03:00:00 EDT" > [35053] "2007-09-09 04:00:00 EDT" "2007-09-09 04:00:00 EDT" > [35055] "2007-09-09 05:00:00 EDT" "2007-09-09 05:00:00 EDT" > [35057] "2007-09-09 06:00:00 EDT" "2007-09-09 06:00:00 EDT" > [35059] "2007-09-09 07:00:00 EDT" "2007-09-09 07:00:00 EDT" > [35061] "2007-09-09 08:00:00 EDT" "2007-09-09 08:00:00 EDT" > [35063] "2007-09-09 09:00:00 EDT" "2007-09-09 09:00:00 EDT" > > > Gregory A. Graves > Lead Scientist > RECOVER Division > Everglades Restoration Resource Area > South Florida Water Management District > Phones: DESK: 561 / 681 - 2563 x3730 > CELL: 561 / 719 - 8157 > > > [[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. > ______________________________________________ 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.
