[R] a little help needed plotting chron object

[Gabor Grothendieck]

I am surprised its not easier but this seems to give something
though the result is not beautiful:

plot(tv,yjunk,pch=yjl, xaxt = "n")
s <- seq(0, 1, .2)
axis(1, s, substr(chron(seq(0, 1, .2)), 11, 15))

On 11/20/06, Randy Zelick <zelickr at pdx.edu> wrote:
> Hello there,
>
> Using R 2.4.0 on Solaris (Unix):
>
> I am trying to control the X axis range on a simple time of day plot.
>
> I made a test program (below) that gets file time stamp information from
> the files in the directory where R starts. The goal of the test program is
> to plot the time of day of file creation on an x axis that spans a
> user-specified range (like 12:00:00 to 15:00:00).
>
> If I allow autoscaling I get nice time values on the plot. If I try to set
> an x range, instead I get numbers between 0 and 1 on the x axis.
>
> Test Program:
>
>
> library(chron)
>
> f=list.files()  # GET THE LIST OF FILES IN THE CURRENT DIRECTORY
> f2=file.info(f) # FOR THE FILES, GET ALL THE INFO
> c5=f2[,5]       # COLUMN 5 IS THE DATE & TIME STAMP
> print(c5)       # LETS SEE IT
>
> of2=order(c5)   # GENERATE ORDERING VECTOR
> c5o=c5[of2]     # PUT FILE NAMES IN ORDER, IN A NEW VECTOR
> print(c5o)      # LETS SEE IT
>
> dl=length(c5o)                      # HOW MANY FILES
> yjunk <- seq(from=1, to=dl, by=1)   # MAKE A VECTOR OF Y VALUES
> yjl <- as.character(yjunk)          # CONVERT Y'S TO CHARACTERS
>
> c5ot <- substr(c5o,11,20)           # EXTRACT JUST THE TIME OF DAY INFO
>
> tv=chron(times=c5ot)                # TURN TOD INTO CHRON OBJECT
>
> plot(tv,yjunk,pch=yjl)              # PLOT DATA
>
> #  ^^^(works with autoscaled x)
>
>
> tlow="00:00:00"                     # SET LOW TOD RANGE VARIABLE
> thigh="23:59:59"                    # SET HIGH TOD RANGE VARIABLE
> tl=chron(times=tlow)                # TURN LOW TOD INTO CHRON OBJECT
> th=chron(times=thigh)               # TURN HIGH TOD INTO CHRON OBJECT
>
> plot(tv,yjunk,pch=yjl,xlim=c(tl,th)) # PLOT DATA
>
> #   ^^^(x labels converted to numbers between 0 and 1)
>
> ========================================================================
>
> Thanks very much for your help.
>
> =Randy Zelick=
>
> R. Zelick                               email: zelickr at pdx.edu
> Department of Biology                   voice: 503-725-3086
> Portland State University               fax:   503-725-3888
>
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>
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