update x-y ranges?

[Leo B. <leo...@um...>]

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?
2. Assuming the syntax was supported, when was support removed?

TIA,
Leo


[1] - https://sourceforge.net/p/maxima/code/ci/master/tree/share/draw/gnuplot.lisp#l902

[2] - https://sourceforge.net/p/maxima/bugs/4424/