[Maxima-discuss] How do I get the keys of a hash table in Maxima?

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

Hi list,

how do I get the keys of a hash table in Maxima?
Or, more concretely, if we run this,

  myhash : make_array(hashed);
  myhash[42] : 420;
  myhash[ab] : "abab";
  myhash[42];           /* 420 */
  myhash[ab];           /* "abab" */
  myhash[cd];           /* false */
  to_lisp();
    (loop for k being the hash-keys in #$myhash$
          collect k)
    (loop for k being the hash-keys in #$myhash$
          if (not (eq k 'dim1))
          collect k)
    (to-maxima)

The first LOOP returns (DIM1 42 $AB) and the second one
returns (42 $AB)... but is there a standard way to get
something like the result of the second loop without using
Lisp?

Some links:

(info "(maxima)make_array")
https://maxima.sourceforge.io/docs/manual/Data-Types-and-Structures.html#index-make_005farray
https://sourceforge.net/p/maxima/code/ci/master/tree/src/ar.lisp

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