Re: [Maxima-discuss] A bug in verbify?

[Stavros M. <mac...@gm...>]

nounify/verbify aren't well-defined for non-Maxima symbols like ?foo.
I suppose we should have this report an error. (
https://sourceforge.net/p/maxima/bugs/4397/)

What is happening is that it adds verb/noun properties both ways when you
nounify.

On Tue, Oct 29, 2024 at 4:30 PM Eduardo Ochs <edu...@gm...> wrote:

> Hi list,
>
> I was trying to fix a bug in how LispTree handles nouns and verbs and
> I think that I found a bug in verbify... try this, and look at what
> happens when we run low(f5(foo)) again after running low(f5(?foo)):
>
>   format([args]) := apply(?format, append([false], args));
>   low(o) := format("~s",o);
>   v(o) := verbify(o);
>   n(o) := nounify(o);
>   f5(o) := [n(v(o)), v(o), o, n(o), v(n(o))];
>   low(f5(foo));   /* ((MLIST SIMP) %FOO $FOO $FOO %FOO $FOO) */
>   low(f5(?foo));  /* ((MLIST SIMP) %FOO  FOO  FOO %FOO  FOO) */
>   low(f5(foo));   /* ((MLIST SIMP) %FOO $FOO $FOO %FOO  FOO) */
>
> The result of verbify(nounify(foo)) changes!
>
>   Cheers =/,
>     Eduardo Ochs
>     http://anggtwu.net/eev-maxima.html
>     http://anggtwu.net/lisptree.html
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