[Maxima-discuss] draw2d(parametric(...)) and Slime/Sly

[Eduardo O. <edu...@gm...>]

Hi all,

in other recent threads we saw that this

  P(t) := [cos(t),sin(t)];
  draw2d(parametric(P(t)[1], P(t)[2], t,0,10));

works but this

  P(t) := if t <= 6 then [t,4] else [6,10-t];
  draw2d(parametric(P(t)[1], P(t)[2], t,0,10));

fails, and yields this error:

  draw2d (parametric): non defined variable

I am learning Sly, that is a fork of Slime, and I just had some ideas
for experiments that I would like to do by modifying temporarily the
Lisp code around the call to listofvars that returns, ahem, "the wrong
answer". But I need help with one basic thing: how do I tell Slime/Sly
to enter the debugger when that error is raised?

  Thanks in advance!
    Eduardo Ochs
    http://anggtwu.net/eev-maxima.html