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

[Thomas S. <t.s...@fz...>]

'help timecolumn' says:

"To find the right `timefmt` string to use, `timecolumn` searches for a
`using` specification with the same column number as its argument.
If one is found, `timefmt` pattern of the target axis for this specifier
is used.  Otherwise, `timecolumn` chooses the x axis `timefmt` per default."

this means, one column for the y axis.


david-825 wrote:
> 
> 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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> to 
> best implement a security strategy that keeps consumers' information
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