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Groups > comp.graphics.apps.gnuplot > #3911

Re: Missing points in multi line plot not being omitted

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On 10.03.2018 08:18, Ethan A Merritt wrote:
> Jörg Buchholz wrote:
> 
>> On 09.03.2018 19:48, Marius Schamschula wrote:
>>
>>>
>>> FYI, I'm using version 5.2 patchlevel 2 under FreeBSD, so indeed
>>> there should not be any quotes around the NaN
>>>
>>> Dealing with single points is easy: add a marker. My problem is
>>> having lines where they shouldn't be.
>>>
>> I have compiled the 5.2.2 Version and it confuse me.
>>
>> set style data linespoints
>> set datafile missing NaN
>> plot '-' u 1:2
>> input data ('e' ends) > 1 10
>> input data ('e' ends) > 2 20
>> input data ('e' ends) > 3 NaN
>> input data ('e' ends) > 4 40
>> input data ('e' ends) > 5 50
>> input data ('e' ends) > e
>>
>> There is no gap in the output.
> 
> Correct. There is no gap because the NaN point is treated as missing.
> From the docs under "help missing"
> 
>    "invalid data causes a gap in a line drawn through sequential
>     data points; missing data does not."
> 
> 
>> unset datafile missing NaN
>> plot '-' u 1:2
>> input data ('e' ends) > 1 10
>> input data ('e' ends) > 2 20
>> input data ('e' ends) > 3 NaN
>> input data ('e' ends) > 4 40
>> input data ('e' ends) > 5 50
>> input data ('e' ends) > e
>>
>> There is a gap between 2 - 4 in the output.
> 
> Yes, because now the point is not "missing".  It is "invalid".
> 
>> In the 5.2 Documentation there are some examples for the "set datafile
>> missing option". Only the examples with "NaN" direct in the data gives
>> a gap.
> 
> Correct.
> 
>> So can you put a "NaN" into your data?
>>
>> IMHO the 5.0 Version works nicer, or more than I expected. Or is it a
>> bug?
> 
>> Jörg
> 
> Perhaps a misunderstanding.   Let me try re-phrasing...
> 
> "Missing" data acts as if no entry at that x coordinate was present
> in the data file at all, so it has no effect on the line being drawn.
> 
> A gap in the line indicates that data at that x coordinate was present,
> but invalid.
> 
> The special command "set datafile missing NaN" tells the program
> to treat invalid data as if it were missing (no gap).
> 
> 	Ethan
> 
Thanks for your explanation. So it was a misunderstanding. But the
behave from gnuplot 5.0 is nice and easy to handle.

So for gnuplot 5.2 the only solution is something like "sed -i
's/?/NaN/g' datafile.dat" before plotting the data or in a pipe?

Jörg

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Missing points in multi line plot not being omitted Marius Schamschula <mschamschula@gmail.com> - 2018-03-07 10:33 -0800
  Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-08 11:39 +0100
    Re: Missing points in multi line plot not being omitted Marius Schamschula <mschamschula@gmail.com> - 2018-03-08 06:35 -0800
      Re: Missing points in multi line plot not being omitted Chris Elvidge <chris@mshome.net> - 2018-03-08 16:24 +0000
      Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-08 20:10 +0100
        Re: Missing points in multi line plot not being omitted Ethan Merritt <sfeam@users.sf.net> - 2018-03-08 19:54 +0000
        Re: Missing points in multi line plot not being omitted Chris Elvidge <chris@mshome.net> - 2018-03-08 20:40 +0000
  Re: Missing points in multi line plot not being omitted Marius Schamschula <mschamschula@gmail.com> - 2018-03-09 10:48 -0800
    Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-09 21:09 +0100
      Re: Missing points in multi line plot not being omitted Ethan A Merritt <EAMerritt@gmail.com> - 2018-03-09 23:18 -0800
        Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-10 10:57 +0100
          Re: Missing points in multi line plot not being omitted Chris Elvidge <chris@mshome.net> - 2018-03-10 11:09 +0000
            Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-10 17:40 +0100
              Re: Missing points in multi line plot not being omitted Chris Elvidge <chris@mshome.net> - 2018-03-10 17:01 +0000
                Re: Missing points in multi line plot not being omitted Jörg Buchholz <bookwood4new@freenet.de> - 2018-03-11 09:47 +0100
                Re: Missing points in multi line plot not being omitted Chris Elvidge <chris@mshome.net> - 2018-03-11 10:41 +0000

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