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

[<da...@la...>]

On Fri, 7 Jan 2011, Thomas Sefzick wrote:

> plot 'datafile.dat' using 1:($3-$2)
>
> doesn't work with time data.
>
> use
> ... using 'timecolumn(3)-timecolumn(2)'
> instead, BUT since you are using different time formats for
> x and y this will not work, too.
> 'timecolumn()' can only use the time format of one column, which is
> assigned to one coordinate, but you are dealing with two columns.

column2 and column3 are the same format, so why can't it use that format 
(the y format)

David Lang

> you could use something like in my previous reply, a little bit extended:
>
> unset ydata
> plot "ts.dat" using 1:( \
>   s=stringcolumn(2),n=strstrt(s,":"), \
>   t=stringcolumn(3),m=strstrt(t,":"), \
>   t[1:m-1]+t[m+1:]/60.-s[1:n-1]-s[n+1:]/60.) w lp
>
>
> Steffen-21 wrote:
>> 
>> 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 Br?ker:
>>> 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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