Groups > comp.graphics.apps.gnuplot > #3910

Re: Missing points in multi line plot not being omitted

From	Ethan A Merritt <EAMerritt@gmail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: Missing points in multi line plot not being omitted
Date	2018-03-09 23:18 -0800
Organization	A noiseless patient Spider
Message-ID	<p800sb$2e6$1@dont-email.me> (permalink)
References	<e3db9e9a-e4f1-44e3-99e4-704d0d59380f@googlegroups.com> <52fd232c-59cd-44b7-bbb3-5b4c52d4bd76@googlegroups.com> <p7upll$74f$1@dont-email.me>

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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

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Thread

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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