Re: update x-y ranges?

[Ethan A M. <me...@uw...>]

On Thursday, 28 November 2024 12:05:39 PST Leo Butler wrote:
> Hi,
> 
> I am not sure if this is the right venue, please re-direct me if it is not.
> 
> In the Maxima package draw [1], one finds a snippet of gnuplot code that
> goes like this:
> 
> w filledcurves~a xy=~a,~a lc ~a axis ~a
> 
> (the ~a are place holder for values, like %s in a printf template).
> 
> According to git, this line was checked in on the first commit of the
> package 18 years ago. We got a bug report yesterday [2] that the part
> 
> xy=....
> 
> is causing an error.
> 
> I have attached the Gnuplot file generated by a trimmed down example
> extracted from that bug report.
> 
> My questions are:
> 
> 1. Was this syntax ever supported by gnuplot? If so, what did it do and
>    how can the same effect be achieved in more recent gnuplots?

It is still supported.  See "help filledcurves".

The error is that this option must immediately follow the "with filledcurves".
Your script sticks an unrelated option (fillstyle solid 0.1) in between the
plot style and the plotstyle-specific options.

After swapping the position of "fillstyle solid 0.1" and "xy=-1.0,0.0" in the
plot command, the script runs without error in both gnuplot 5 and gnuplot 6.

Eighteen years ago  would have been early gnuplot version 4, I think, and 
many of the options in your script did not exist, including "fillstyle solid 0.1".

	Ethan

> 2. Assuming the syntax was supported, when was support removed?
> TIA,
> Leo
> 
> 
> [1] - https://urldefense.com/v3/__https://sourceforge.net/p/maxima/code/ci/master/tree/share/draw/gnuplot.lisp*l902__;Iw!!K-Hz7m0Vt54!lkzvVp1SpWsUImWc4fB3wG8IS2eDAXgREdoZNLaZ-T2LJ0Qf3VWTarY4SQx8aNSFweyKiYY_3BJzMmM2ggZ5KTkdl_MsIA$ 
> 
> [2] - https://urldefense.com/v3/__https://sourceforge.net/p/maxima/bugs/4424/__;!!K-Hz7m0Vt54!lkzvVp1SpWsUImWc4fB3wG8IS2eDAXgREdoZNLaZ-T2LJ0Qf3VWTarY4SQx8aNSFweyKiYY_3BJzMmM2ggZ5KTnC6B_VdA$ 
> 
> 


-- 
Ethan A Merritt
Department of Biochemistry
University of Washington, Seattle