Re: [Maxima-discuss] probable bug in sqrt

[Richard F. <fa...@gm...>]

for example,
:lisp (cquotient 2 3)
produces the same message.
Evaluating this in the top-level context may be
why the tag  RAT-ERR  does not exist.
RJF



On Sat, Nov 15, 2025 at 6:02 AM David Scherfgen via Maxima-discuss <
max...@li...> wrote:

> Michel Talon <ta...@lp...>:
>
>> I think there is definitely a bug here: tracing the function cquotient
>> shows there are a lot of calls to cquotient which work OK and then a last
>> one which bombs out. This can be reproduced in a fresh maxima session:
>>
>> (%i1) :lisp(MAXIMA::CQUOTIENT 188021706981212160 -32188114592695296)
>> Maxima encountered a Lisp error:
>>  attempt to THROW to a tag that does not exist: RAT-ERR
>>
> I have difficulty in understanding how this is not a bug in maxima or how
>> this bug is related to algebraic dependencies. Maybe the numbers are too
>> big for some reason.
>>
> This is by design.
> The comment above cquotient says:
>
> ;; If MODULUS is nil, then we work over the ring of integers when A and B
> are
> ;; integers, and raise a RAT-ERROR if A is not divisible by B.
>
> Best regards
> David
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