Re: [Gnuplot-info] Need help: Time/date format

[Steffen <st...@on...>]

Wonderful! That works and is even smarter.
But I stumble over the next problem connected with time data:
If a have a file with date, sunrise and sunset time in three columns 
like this:
2010-12-02 7:53 15:55
2010-12-03 7:55 15:54
2010-12-06 7:59 15:53
2010-12-07 8:00 15:53
2010-12-09 8:02 15:52
2010-12-10 8:04 15:52
and I want to plot the length of the day, i.e. sunset-sunrise then
plot 'datafile.dat' using 1:($3-$2)
does not produce the desired result. It seems that every calculation on 
time formatted columns does not produce the expected results. How should 
calculations with dates/times be done?
Steffen


Am 06.01.2011 21:35, schrieb Hans-Bernhard Bröker:
> On 06.01.2011 00:23, da...@la... wrote:
>> currently gnuplot only supports time on the X axis,
> I wonder what made believe that.
>
>> what you would need to
>> do is to manipulate the data before gnuplot tries to use it.
> No.  This works:
>
> gnuplot>  set xdata time
> gnuplot>  set ydata time
> gnuplot>  set timefmt x '%Y-%m-%d'
> gnuplot>  set timefmt y '%H:%M'
> gnuplot>  p '-' u 1:2 w lp
> input data ('e' ends)>  2010-12-02 7:53
> input data ('e' ends)>  2010-12-03 7:55
> input data ('e' ends)>  2010-12-06 7:59
> input data ('e' ends)>  2010-12-07 8:00
> input data ('e' ends)>  e
> gnuplot>
>
>
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