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Newsgroups: comp.graphics.apps.gnuplot
Date: Tue, 22 Aug 2017 07:57:40 -0700 (PDT)
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Subject: Re: Ephemerides data
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Xref: csiph.com comp.graphics.apps.gnuplot:3722

On Tuesday, August 22, 2017 at 3:59:32 AM UTC+2, Karl Ratzsch wrote:

> > On Monday, August 21, 2017 at 4:59:16 AM UTC+2, Karl Ratzsch wrote:
>=20
> >>> $dat << EOD
> >>> 8/20/2017;12:00:00 UTC+1.0;10h 35m 50.60s;+03=C2=B0 47' 15.38";
> >>> 8/21/2017;12:00:00 UTC+1.0;10h 33m 13.63s;+04=C2=B0 02' 23.70";
> >>> 8/22/2017;12:00:00 UTC+1.0;10h 30m 23.99s;+04=C2=B0 20' 34.64";
> >>> EOD
> >>>
> >> set dataf sep "; " # the backslash was nonsense
> >> set table
> >>
> >> plot $dat us \
> >> (timecolumn(1,"%d/%m/%Y")):\
> >> (timecolumn(2,"%H:%M:%S")+strcol(3)[4:8]*3600):\
> >> (timecolumn(4,"%Hh %Mm %Ss")/3600):\
> >> (($7+$8/60+$9/3600)) w table
> >>
>=20
>=20
> > However I still have an issue:
> >=20
> > When I add the code for the timezone specifier ( +strcol(3)[4:8]*3600) =
)
> > I get the errormessage "Non-numeric string found where a numeric expres=
sion was expected"
> >=20
>=20
> gnuplot automatically converts strings to numberic variables in
> expressions (i.e. if you do math like *1.0) if possible.
>=20
> Can you make an example like the one above that I can directly copy
> into gnuplot to reproduce your problem?

No problem:

1. Putting these lines in a CSV file will give the errormessage:

Date;Time;Local R.A.;Local Dec.;
8/20/2017;12:00:00 UTC+1.0;10h 35m 50.60s;+03=C2=B0 47' 15.38";
8/21/2017;12:00:00 UTC+1.0;10h 33m 13.63s;+04=C2=B0 02' 23.70";
8/22/2017;12:00:00 UTC+1.0;10h 30m 23.99s;+04=C2=B0 20' 34.64";


2. I saw another strange behaviour:
when values go negative they show strange jumps.
sample data below:

Date;Time;Local R.A.;Local Dec.;
9/15/2016;12:00:00 UTC+1.0;12h 06m 27.95s;+00=C2=B0 29' 21.10";
9/16/2016;12:00:00 UTC+1.0;12h 07m 15.28s;+00=C2=B0 24' 12.97";
9/17/2016;12:00:00 UTC+1.0;12h 08m 02.66s;+00=C2=B0 19' 04.67";
9/18/2016;12:00:00 UTC+1.0;12h 08m 50.08s;+00=C2=B0 13' 56.25";
9/19/2016;12:00:00 UTC+1.0;12h 09m 37.55s;+00=C2=B0 08' 47.73";
9/20/2016;12:00:00 UTC+1.0;12h 10m 25.06s;+00=C2=B0 03' 39.15";
9/21/2016;12:00:00 UTC+1.0;12h 11m 12.60s;-00=C2=B0 01' 29.46";
9/22/2016;12:00:00 UTC+1.0;12h 12m 00.17s;-00=C2=B0 06' 38.07";
9/23/2016;12:00:00 UTC+1.0;12h 12m 47.76s;-00=C2=B0 11' 46.64";
9/24/2016;12:00:00 UTC+1.0;12h 13m 35.38s;-00=C2=B0 16' 55.14";
9/25/2016;12:00:00 UTC+1.0;12h 14m 23.01s;-00=C2=B0 22' 03.55";
9/26/2016;12:00:00 UTC+1.0;12h 15m 10.65s;-00=C2=B0 27' 11.81";
9/27/2016;12:00:00 UTC+1.0;12h 15m 58.31s;-00=C2=B0 32' 19.91";
9/28/2016;12:00:00 UTC+1.0;12h 16m 45.96s;-00=C2=B0 37' 27.81";
9/29/2016;12:00:00 UTC+1.0;12h 17m 33.62s;-00=C2=B0 42' 35.48";
9/30/2016;12:00:00 UTC+1.0;12h 18m 21.27s;-00=C2=B0 47' 42.88";
10/1/2016;12:00:00 UTC+1.0;12h 19m 08.92s;-00=C2=B0 52' 49.97";
10/2/2016;12:00:00 UTC+1.0;12h 19m 56.55s;-00=C2=B0 57' 56.74";
10/3/2016;12:00:00 UTC+1.0;12h 20m 44.16s;-01=C2=B0 03' 03.13";
10/4/2016;12:00:00 UTC+1.0;12h 21m 31.75s;-01=C2=B0 08' 09.13";
10/5/2016;12:00:00 UTC+1.0;12h 22m 19.31s;-01=C2=B0 13' 14.69";
10/6/2016;12:00:00 UTC+1.0;12h 23m 06.84s;-01=C2=B0 18' 19.78";
10/7/2016;12:00:00 UTC+1.0;12h 23m 54.34s;-01=C2=B0 23' 24.38";
10/8/2016;12:00:00 UTC+1.0;12h 24m 41.80s;-01=C2=B0 28' 28.43";
10/9/2016;12:00:00 UTC+1.0;12h 25m 29.21s;-01=C2=B0 33' 31.92";
10/10/2016;12:00:00 UTC+1.0;12h 26m 16.58s;-01=C2=B0 38' 34.80";
10/11/2016;12:00:00 UTC+1.0;12h 27m 03.89s;-01=C2=B0 43' 37.05";
10/12/2016;12:00:00 UTC+1.0;12h 27m 51.14s;-01=C2=B0 48' 38.62";
10/13/2016;12:00:00 UTC+1.0;12h 28m 38.33s;-01=C2=B0 53' 39.49";
10/14/2016;12:00:00 UTC+1.0;12h 29m 25.45s;-01=C2=B0 58' 39.62";
10/15/2016;12:00:00 UTC+1.0;12h 30m 12.50s;-02=C2=B0 03' 38.98";
10/16/2016;12:00:00 UTC+1.0;12h 30m 59.48s;-02=C2=B0 08' 37.53";
10/17/2016;12:00:00 UTC+1.0;12h 31m 46.37s;-02=C2=B0 13' 35.23";
10/18/2016;12:00:00 UTC+1.0;12h 32m 33.18s;-02=C2=B0 18' 32.06";
10/19/2016;12:00:00 UTC+1.0;12h 33m 19.90s;-02=C2=B0 23' 27.98";
10/20/2016;12:00:00 UTC+1.0;12h 34m 06.52s;-02=C2=B0 28' 22.95";
10/21/2016;12:00:00 UTC+1.0;12h 34m 53.04s;-02=C2=B0 33' 16.94";
10/22/2016;12:00:00 UTC+1.0;12h 35m 39.45s;-02=C2=B0 38' 09.91";
10/23/2016;12:00:00 UTC+1.0;12h 36m 25.76s;-02=C2=B0 43' 01.84";

Thanks for your help.