[Octave-bug-tracker] [bug #48033] gnuplot toolkit uses features not available in gnuplot 4.4

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?48033>

                 Summary: gnuplot toolkit uses features not available in
gnuplot 4.4
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Thu 26 May 2016 11:41:06 AM PDT
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Running some plot demos with (yes, ancient version of) gnuplot 4.4 throws a
lot of errors of the type:


>> plot (1:10)

gnuplot> set linetype 9 default;
             ^
         line 0: Unrecognized option.  See 'help set'.


gnuplot> set linetype 9 linecolor rgb "#0000ff" dashtype solid linewidth
0.500000;
             ^
         line 0: Unrecognized option.  See 'help set'.


gnuplot> set linetype 10 default;
             ^
         line 0: Unrecognized option.  See 'help set'.


gnuplot> set linetype 10 linecolor rgb "#0000ff" pointsize 2.000000;
             ^
         line 0: Unrecognized option.  See 'help set'.



I see there are various version and feature checks in place in the gnuplot
m-files, but apparently the code has now advanced beyond what this is checking
for.

If there are certain features that can be used or not used, we need more
checks for those. If this "set linetype" needs to be used everywhere (I see it
on every plot I try), then we need a check for whatever version introduced
that feature.

There is already a "minimum_version" feature, which is currently testing for
gnuplot >= 4.2.5.




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