Michel, thanks for posting the code and demonstration script.
A demonstration is good, but for the purpose of maintaining the
code, a regression test is even better. For Maxima such a script
comprises pairs of expressions -- the first is the input and the
second is the expected result. batch("rtest_script.mac", test)
executes the test. run_testsuite() executes all the test scripts
in maxima/tests/. This system is very helpful to automatically
verify that functions are working as expected.
All the best,
Robert Dodier