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Groups > comp.graphics.apps.gnuplot > #1458
| Newsgroups | comp.graphics.apps.gnuplot |
|---|---|
| Date | 2012-10-31 06:44 -0700 |
| References | <cf7a8cca-4187-432d-84f9-1c6df0bf7871@googlegroups.com> <k6nbur$pep$1@dont-email.me> <9ceb5771-afd5-4a4e-b90e-00f8f283626a@googlegroups.com> <k6qef5$2ac$1@dont-email.me> |
| Message-ID | <c1f7353a-7493-447f-b2bb-2b116286df67@googlegroups.com> (permalink) |
| Subject | Re: plotting data directly from an Internet link? |
| From | TonyG <tgozdz@gmail.com> |
On Wednesday, October 31, 2012 1:54:46 AM UTC-4, sfeam wrote:
> TonyG wrote:
>
>
>
> > On Monday, October 29, 2012 9:53:32 PM UTC-4, sfeam wrote:
>
> >> TonyG wrote:
>
> >>
>
> >>
>
> >>
>
> >> > Is it possible to use an Internet link to some column-formatted
>
> >> > data
>
> >>
>
> >> > as the data source for the 'file' part of the 'plot' command?
>
> >>
>
> >> >
>
> >>
>
> >> > A good example would be plotting selected columns from
>
> >>
>
> >> > http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt
>
> >>
>
> >> >
>
> >>
>
> >> > BTW, since I use a WinXP OS, I doubt I could use the pop(x) method
>
> >> > as
>
> >>
>
> >> > described in the Help file, e.g.,
>
> >>
>
> >> >
>
> >>
>
> >> > pop(x) = 103*exp(-x/10)
>
> >>
>
> >> > plot "< awk '{print $1-1965, $2}' population.dat", pop(x)
>
> >>
>
> >>
>
> >>
>
> >>
>
> >>
>
> >> You say "I doubt I could use....".
>
> >>
>
> >> But have you actually tried it?
>
> >
>
> > Now I have... ;-)
>
> >
>
> >>
>
> >> So long as the gnuplot executable supports pipes, you should
>
> >>
>
> >> be OK.
>
> >
>
> > Yes, I'm using gnuplot_pipes as my default executable. (BTW, why are
>
> > there two versions if gnuplot_pipes has more capabilities; is there
>
> > something missing in it in comparison to std. gnuplot?)
>
>
>
> Good question. I'm not a Windows user, but my understanding is
>
> that the distinction went away in version 4.6 because all the
>
> functionality of both the previous versions is in the single
>
> executable gnuplot.exe
>
>
>
>
>
> >> At least under linux one answer is
>
> >>
>
> >> plot "< GET http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt"
>
> >>
>
> >>
>
> >>
>
> >> where GET is a widely-distributed perl script roughly equivalent
>
> >>
>
> >> to wget. If you prefer wget, then
>
> >>
>
> >> plot "< wget -O -
>
> >> http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt"
>
> >
>
> > Thanks; wget works, and downloads and displays the data when used from
>
> > the command line. However, it bombs out when used inside gnuplot:
>
> >
>
> > gnuplot> plot "< wget -O -
>
> > http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt" using ($13) w lp
>
> > warning: Skipping unreadable file "< wget -O -
>
> > http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt" No data
>
> > in plot
>
> >
>
> > The input file has a two-row header:
>
> >
>
> > #YY MM DD hh mm WDIR WSPD GST WVHT DPD APD MWD PRES ATMP
>
> > #WTMP DEWP VIS PTDY TIDE
>
> > #yr mo dy hr mn degT m/s m/s m sec sec degT hPa degC
>
> > #degC degC nmi hPa ft
>
> > 2012 10 30 14 50 120 6.0 8.0 3.1 11 7.2 104 1001.2 14.0
>
> > 12.4 12.5 MM +2.8 MM
>
> > 2012 10 30 13 50 130 8.0 9.0 3.3 10 7.6 95 1000.4 14.1
>
> > 12.4 12.6 MM +2.6 MM
>
> >
>
> > but in my experience gnuplot handles such cases easily... I have
>
> > tried various changes, but to no avail--I'm stuck.
>
>
>
> I don't know. That command works for me under linux.
>
> I get this output:
>
>
>
> gnuplot> set term dumb
>
> gnuplot> plot "< wget -O - http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt" using ($13) w lp
>
> --2012-10-30 22:53:12-- http://www.ndbc.noaa.gov/data/5day2/44013_5day.txt
>
> Resolving www.ndbc.noaa.gov (www.ndbc.noaa.gov)... 140.90.238.27
>
> Connecting to www.ndbc.noaa.gov (www.ndbc.noaa.gov)|140.90.238.27|:80... connected.
>
> HTTP request sent, awaiting response... 200 OK
>
> Length: 11468 (11K) [text/plain]
>
> Saving to: “STDOUT”
>
>
>
> 100%[============================================>] 11,468 48.3K/s in 0.2s
>
>
>
> 2012-10-30 22:53:13 (48.3 KB/s) - written to stdout [11468/11468]
>
>
>
> 1025 ++---------+-----------+----------+----------+-----------+----AA-AAA+
>
> + + + + + + AAAAA+ +
>
> 1020 ++ AAAAAAA ++
>
> | AAAAAAA |
>
> | AAAAAAAAA |
>
> 1015 ++ AAAAAAA ++
>
> | AA A |
>
> 1010 ++ A A ++
>
> | A |
>
> | AA |
>
> 1005 ++ A ++
>
> | A AAAAA AA |
>
> 1000 AA A AA AA ++
>
> | AA A |
>
> 995 ++ AA A ++
>
> | AA A |
>
> | A A A |
>
> 990 ++ A AA ++
>
> + + + + + + +
>
> 985 ++---------+-----------+----------+----------+-----------+---------++
>
> 0 20 40 60 80 100 120
And now, suddenly and for an unexplained reason, I am getting the same result as yours, both with dumb and windows terminals.
You've been most helpful, thank you.
--Tony
Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Find similar | Unroll thread
plotting data directly from an Internet link? TonyG <tgozdz@gmail.com> - 2012-10-29 10:15 -0700
Re: plotting data directly from an Internet link? James <jjpuzzles@wowway.com> - 2012-10-29 13:00 -0700
Re: plotting data directly from an Internet link? TonyG <tgozdz@gmail.com> - 2012-10-29 15:19 -0700
Re: plotting data directly from an Internet link? sfeam <sfeam@users.sourceforge.net> - 2012-10-29 18:53 -0700
Re: plotting data directly from an Internet link? TonyG <tgozdz@gmail.com> - 2012-10-30 08:56 -0700
Re: plotting data directly from an Internet link? sfeam <sfeam@users.sourceforge.net> - 2012-10-30 22:54 -0700
Re: plotting data directly from an Internet link? TonyG <tgozdz@gmail.com> - 2012-10-31 06:44 -0700
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