Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.graphics.apps.gnuplot > #3904

Re: Missing points in multi line plot not being omitted

Show all headers | View raw

On 08/03/2018 02:35 pm, Marius Schamschula wrote:
> On Thursday, March 8, 2018 at 4:39:37 AM UTC-6, Jörg Buchholz wrote:
>> On 07.03.2018 19:33, Marius Schamschula wrote:
>>> I'm trying to make a plot of wind speed and wind gusts. The data for wind gusts is not continuous. If I use datafile missing on the wind gust data by itself, things work as expectedly, but if I try to plot gusts along with wind speed, gusts data are shown for times where there is no data. The plot omits gusts data at the beginning and end, but in the middle line segments are drawn where they should not. For example
>>>
>>> set datafile missing NaN
>>> set grid
>>> set time
>>> set xdata time
>>> set timefmt "%Y-%m-%d:%H:%M:%S"
>>> unset timestamp
>>> plot '-' u 1:2 t 'Wind' w lines lt rgb "blue", '-' u 1:3 t 'Gust' w lines
>>
>>
>> You can (or must?) use the following syntax to get a gap on the plot:
>> plot '-' u 1:($2) t 'Wind' w lines lt rgb "blue", '-' u 1:($3) t 'Gust'
>> w lines
>>
>> Write in the plot command for the "Y-column" ($2), as example for column
>> 2 as Y-value.
>>
>> Jörg
> 
> Given the example in the documentation, I also have tried just that syntax. The result: no plot at all.
> 

I've just tried with a copy of your file (as original post), but with 
"set datafile" line commented out (caused an error on my system) and set 
format x "%m/%d\n%H:%M" inserted. I also put in commands to send output 
to an svg file. Viz:

set terminal svg size 1100,600 dynamic font 'Verdana,14'
set output "/var/www/html/wind-and-gusts.svg"
#set datafile missing NaN
set grid
set time
set xdata time
set timefmt "%Y-%m-%d:%H:%M:%S"
unset timestamp
set format x "%m/%d\n%H:%M"
set ylabel "Speed (MPH)"
set xlabel "Date/Time"

Plotline:

plot '-' u 1:2 t 'Wind' w lines lt rgb "blue", '-' u 1:($3) t 'Gust' w 
lines, '-' u 1:3 t '' w impulses, '-' u 1:($3):3 t '' w labels

shows where using "with lines" falls down - i.e. the last gust is a 
point. Of course, you have to adjust the data list to make this work.

Gnuplot Version 5.0 patchlevel 5.

-- 

Chris Elvidge, England

Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Next in thread | Find similar

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

csiph-web