Re: plot with vectors

[Hamish Allan]

On Apr 22, 2005, at 19:46, John W. Eaton wrote:

> I'm guessing you are not using 2.1.69 or the 2.9.x series, because
> those versions would tell you that gplot is obsolete.

You're quite right. Unfortunately I couldn't get 2.9.1 to compile out 
of the box on OS X, and I don't have time right now to play with it. If 
Jeffrey Whitaker is reading, it'd be lovely to see a newer version than 
2.1.64-2 in Fink unstable.

> In 2.9.x, you can use
>
>   __gnuplot_plot__ a with vector
>
> because the plot command is only subject to minimal parsing (to
> recognize the data comes from "a") and then the rest of the command is
> passed on to gnuplot unchanged.

I guess that's what I'm going to end up doing anyway... just writing 
the results out to a file and then reading them into Gnuplot.

> In the 2.1.x and earlier versions of Octave, gplot did a lot more
> parsing, so adding support for things like "with vector" meant
> changing the parser, which was a lot of work that no one was willing
> to do.  Also, since gnuplot is a moving target, even if someone were
> willing to do the work, Octave was likely to be out of sync with
> gnuplot most of the time anyway.

Very understandable.

> In any case, even the new __gnuplot_*__ functions are really only for
> use as internal commands.  If you need vector plots, you should write
> a higher-level plot routine that does what you need.  If the
> higher-level function needs to use __gnuplot_plot__, then at least it
> is isolated to one function.

Right you are.

Best wishes,
Hamish



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