> On Sep 19, 2018, at 10:48 PM, Ogbos Okike <giftedlife2...@gmail.com> wrote:
>
> Hi David,
> That's it!!! The outcome is attached.
The explanation for this is that columns that have digits separated by dashes
will not be interpreted by R's read.table() as numeric or dates, but rather as
the default for text entries: as R factors. Factors are stored as numbers with
an associated attribute that gets used to display the meaning of those numbers.
Since the numbers used are integers from 1 to the count of unique items, using
the xlim = as.numeric(as.Date(.)) creates values are far outside the range of
the factor integers and nothing gets displayed as a result. If you had used
range(as.numeric(<factor-variable-name>)) you might have seen something.
Whether it was what you wanted to see .... well, that's another matter!
Good luck understanding R factors. Some research centers have adopted a policy
of setting the option used by read.table for that behavior with:
options(stringsAsFactors= FALSE) # can be set in .Rprofile or other "startup"
file.
That produces text rather than factors by default and might result in less
confusion.
--
David.
>
> Many thanks please.
>
> Best
> Ogbos
>
> On Wed, Sep 19, 2018 at 11:34 PM David Winsemius <dwinsem...@comcast.net>
> wrote:
>
> > On Sep 19, 2018, at 7:55 AM, Ogbos Okike <giftedlife2...@gmail.com> wrote:
> >
> > Dear Experts,
> > I generated the plot attached. Every other thing is OK except the black
> > horizontal lines which should appear like points or dots as the coloured
> > ones. I can't understand why.
> >
> > I tried to change it to look like dots by calling empty plots so that I
> > will add them as points.
> >
> > Since I have a range of date that can fall any where within 2005, I tried:
> >
> > plot(1, type="n", xlab="", ylab="",
> > xlim=c(as.Date("2005-01-01"),as.Date("2005-12-31")), ylim=c(-.5, -10))
> >
> > ylim worked fine but xlim instead of appearing like date as indicated on
> > the x-axes of the attached plot, translated to ordinary numbers (12800,
> > 12900,13000, 13100).
> >
> > All the data is of the same format:
> > 2005-01-04 -2.76105935648091
> > 2005-01-19 -9.60813496025994
> > 2005-01-22 -7.92101965866777
> > 2005-02-19 -1.61308152604905
> > 2005-02-24 -1.51497015807712
> > 2005-05-09 -2.06465797304654
> > 2005-05-11 -1.14840389007051
> > 2005-05-16 -3.85281900888504
> > 2005-06-13 -1.18659683796617
> > 2005-06-17 -3.48787712566258
> > 2005-06-22 -1.14223758296308
> > 2005-07-18 -4.96013018907366
> > 2005-08-03 -1.24313324914368
> > 2005-08-07 -2.96672894841722
> > 2005-08-10 -1.11868063781156
> > 2005-08-25 -1.46453734930983
> > 2005-09-13 -8.00895215754776
> > 2005-09-15 -6.63439065989452
> > 2005-10-13 -2.25054996925846
> > 2005-12-15 -1.08933890547705
>
> You did not succeed in creating a plot that the rhelp mail server would
> accept. My guess is that the first column is a factor variable and that you
> did not use colClasses when doing your data input.
>
> dd <- read.table(text="2005-01-04 -2.76105935648091
> 2005-01-19 -9.60813496025994
> 2005-01-22 -7.92101965866777
> 2005-02-19 -1.61308152604905
> 2005-02-24 -1.51497015807712
> 2005-05-09 -2.06465797304654
> 2005-05-11 -1.14840389007051
> 2005-05-16 -3.85281900888504
> 2005-06-13 -1.18659683796617
> 2005-06-17 -3.48787712566258
> 2005-06-22 -1.14223758296308
> 2005-07-18 -4.96013018907366
> 2005-08-03 -1.24313324914368
> 2005-08-07 -2.96672894841722
> 2005-08-10 -1.11868063781156
> 2005-08-25 -1.46453734930983
> 2005-09-13 -8.00895215754776
> 2005-09-15 -6.63439065989452
> 2005-10-13 -2.25054996925846
> 2005-12-15 -1.08933890547705", colClasses=c("Date","numeric")
> )
>
>
> No problems with:
>
> plot(dd[[1]], dd[[2]], xlim=c(as.Date("2005-01-01"),as.Date("2005-12-31")))
>
>
> (Not a particularly good test of the use of an xlim argument since nothing
> was excluded.)
>
> PDF's are accepted. PNGs are not.
>
> --
> David.
> >
> > Thank you so much for your input.
> >
> > Best regards
> > Ogbos
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
> David Winsemius
> Alameda, CA, USA
>
> 'Any technology distinguishable from magic is insufficiently advanced.'
> -Gehm's Corollary to Clarke's Third Law
>
>
>
>
>
> <Ogbos.pdf>
David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.'
-Gehm's Corollary to Clarke's Third Law
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
