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Re: Histogram like plot with time xdata time...

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On 26/01/15 16:50, Karl wrote:
> Am 26.01.2015 um 16:02 schrieb Colin Brough:
>> On 26/01/15 09:23, Karl wrote:
>>> Am 23.01.2015 um 11:46 schrieb Colin Brough:
>>>> Folks
>>>>
>>>> I have three values for each month, in a data file formatted:
>>>>
>>>> YYYY:MM   D1  D2  D3
>>>>
>>>> I am attempting to plot these in a histogram like format, three
>>>> boxes/columns adjacent to each other for each month. Histograms don't
>>>> quite work (unless I'm missing something), as there may be months with
>>>> no data and I'd like the X-axis to read as time. Its easy enough to do
>>>> with linespoints (plot file included), but with xdata set to 'time', I
>>>> am struggling...
>>>>
>>>> With 'annual' data ("YYYY  DD1 DD2 DD3") its easy enough, since you
>>>> can:
>>>>       plot "data.dat" using ($1 - 0.25):($2 * 100) with boxes title
>>>> "DD1",\
>>>>           "data.dat" using 1:($3 * 10) with boxes title "DD2",\
>>>>           "data.dat" using ($1 + 0.25):4 with boxes title "DD3"
>>>
>>>
>>> With time data, ($1-0.25) does not work, because 1 is not in years but
>>> "seconds since 1970" (or 2000, depending on your gp version).
>>>
>>> Something like ($1-0.25*30*24*3600) should do the trick by moving the
>>> bar a quarter of a month to the left.
>>
>> That's what I thought too, but that doesn't seem to work as expected:
>>
>> plot [][0:] "data.dat" using 1:($2 * 100) with boxes title "Workouts
>> (x100)",\
>>      "data.dat" using ($1 - 648000):($3 * 10) with boxes title "Time
>> (x10)",\
>>      "data.dat" using ($1 + 648000):4 with boxes title "Calories"
>>
>> This produces a plot that looks like this:
>>
>>      http://www.colinbrough.pwp.blueyonder.co.uk/2015_01_26_TimeBarChart.png
>>
>> The blue and green columns at 01/2000 come from the the ($1 - 648000)
>> and ($1 + 648000) plots... (Time and Calories). The red (Workouts) is
>> what I'm expecting...
>>
>> For the sake of completeness, I'm running gnuplot 4.6 patchlevel 4 on
>> Ubuntu 14.04.1 LTS.
>
> "$1" seems to not use the time format. You should be able to work around
> that by using (timecolumn(1)+- 648000)) instead of just ($1+- 648000), i
> think. Looks like an old bug.
>
> You can give the boxes a width by "using 1:($2*100):(648000)", btw.

Thanks, that's working fine now. Hadn't come across "timecolumn" before.

Was using 'set boxwidth XX' for the width of the boxes, but thanks for
that tip too...

Cheers

Colin

-- 

----------------------------------------------------------------------
Colin Brough                           Colin.Brough@blueyonder.invalid
                                 (Replace .invalid with .co.uk to reply)

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Thread

Histogram like plot with time xdata time... Colin Brough <Colin.Brough@blueyonder.co.uk> - 2015-01-23 10:46 +0000
  Re: Histogram like plot with time xdata time... Karl <mail.kfr@gmx.net> - 2015-01-26 10:23 +0100
    Re: Histogram like plot with time xdata time... Colin Brough <Colin.Brough@blueyonder.co.uk> - 2015-01-26 15:02 +0000
      Re: Histogram like plot with time xdata time... Karl <mail.kfr@gmx.net> - 2015-01-26 17:50 +0100
        Re: Histogram like plot with time xdata time... Colin Brough <Colin.Brough@blueyonder.co.uk> - 2015-01-26 17:41 +0000

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