New package for drawing direction fields with gnuplot
Subject: New package for drawing direction fields with gnuplot
From: Mark H Weaver
Date: Thu, 18 Nov 2010 14:17:20 -0500
Adam Majewski <adammaj1 at o2.pl> writes:
> (%i3) wxdrawdf(2*cos(t)-1+y, [t,-5,10], [y,-4,9], [trajectory_at,0,0])$
> Maxima encountered a Lisp error:
> Error in PROG [or a callee]: The variable $MAKE_F_RK_4 is unbound.
[...]
> Maxima version: 5.20.1
Strange. make_f_rk_4() is clearly defined in drawdf.mac, and is called
only from calc_soln_curve(), which I translate() for efficiency. Have I
done something wrong, or is this a bug in translate() which was fixed in
Maxima 5.21.1?
What happens if you comment out "translate(calc_soln_curve)" in
drawdf.mac?
Mark