Re: '__gnuplot_has_feature__' undefined

[Daniel J Sebald]

On 09/02/2016 12:39 PM, Rik wrote:
> On 09/02/2016 10:32 AM, Daniel J Sebald wrote:
> > On 09/02/2016 12:20 PM, Mike Miller wrote:
> > > On Fri, Sep 02, 2016 at 11:57:08 -0500, Daniel J Sebald wrote:
> > > > My thinking is "yes" and "no".  Yes on the bigger items, such as things
> > > > that
> > > > might cause a v4.0 series gnuplot to fail to interpret properly and
> > > > therefore not create a plot.  No on fairly special cases that might be
> > > > outside the ordinary type of plot.
> > > >
> > > > By disallowing older versions of gnuplot, that's ruling out users who are
> > > > looking to put in some simple data and create a simple plot (say a line
> > > > plot), e.g., the non-power-user class.  Say, for example students
> > > > creating a
> > > > lab report.
> > >
> > > That is a reasonable position to take, but the logic must be put into
> > > the scripts to support that. It is broken as it is right now and not
> > > ready for release IMHO.
> > >
> > > There is already a set of checks and functions in place for whether
> > > gnuplot supports certain features. That needs to be updated to work with
> > > the current baseline. There are many places now where Octave sends a
> > > command to gnuplot, and gnuplot responds with an arcane (to the Octave
> > > user) error message about unsupported syntax or options.
> >
> > The main one has revolved around gnuplot's "line style" vs. "line type",
> > the similarity of syntax leading to confusion.  I've tried fixing a few
> > of those.  (I know the waterfall demo still has an issue with some dotted
> > lines that should be solid.)
>
> Even a simple plot fails to execute correctly with 4.6.6
>
> plot (1:10, '--')
>
> It doesn't throw an error, but the line is always solid regardless of the
> linestyle set in Octave.
>
> --Rik

What terminal within gnuplot are you using?  wxt?  Qt?  x11?

I've pulled gnuplot 4.6.6 from that project's version control.  I had a 
bit of problem compiling and had to hack the "prepare" file.  Got it to 
compile.  But I have no gnuplot Qt terminal (probably because I've 
switched to Qt 5.0 on my system).  When I try the "wxt" terminal, I see 
some really bad looking errors.  But, if I switch to GNUTERM='x11' 
terminal in may .bashrc file, and run

plot (1:10, '--')
print -dpng 'test.png'

I see dotted lines for both the X11 plot and the PNG file.

The only recollection that comes to mind is that the X11 terminal (if 
that is what you happen to be using) needs some special X11 file to 
properly define line patterns.  Anyway, do the above commands produce a 
PNG file that has dashed lines on your system?

Dan