> The function you want for extracting characters from a string is charlist:
> (%i1) charlist("my_string");
> (%o1) [m, y, _, s, t, r, i, n, g]
>
It works for me in ubuntu:
Maxima 5.14.99rc1 http://maxima.sourceforge.net
Using Lisp CLISP 2.41 (2006-10-13)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) charlist("my_string");
(%o1) [m, y, _, s, t, r, i, n, g]
--
Mario Rodriguez Riotorto
http://www.telefonica.net/web2/biomates