Re: Temporarily suppress all error messages

If you are using a recent version of maxima, you can do the following at
the terminal:

:lisp(setf *error-output* (make-output-string-stream))

Alternatively, you can save the line

(setf *error-output* (make-output-string-stream))

in a start-up file (e.g. maxima-init.lisp) and make sure it gets loaded
at start-up.

Explanation: in recent versions of Maxima, errors and warnings are
printed to the output stream *ERROR-OUTPUT*. That can be rebound to a
"string stream", which results in the diversion of the error messages to
a sink.

Best regards,
Leo


On Tue, May 19 2026, Michel Talon <[email protected]> wrote:

> Le 19/05/2026 à 04:52, Astrea Drifter a écrit :
>>
>> While searching for solutions, I found a thread where the following
>> commands were recommended to turn off error and warning messages
>> respectively, and these seemed well suited for the use case of that
>> thread's op:
>> :lisp (defun merror(&rest foo) nil)
>> :lisp (defun mtell (&rest foo) nil)
>>
>> Unfortunately, while I have some experience with Maxima, I know
>> nothing at all about Lisp.
>
> A little pedagogy: a lot of errors in maxima trigger the function
> merror, which outputs the appropriate error message. In lisp you can
> redefine any function, so when doing  (defun merror(&rest foo) nil)
> you are just redefining merror to produce nil, for whatever arguments
> you feed merror with (&rest foo). Idem for mtell which is triggered by
> less severe problems. But this does not work for your use case because
> the error is produced at the level of the parser (nparse.lisp) in
> which errors do not call merror or mtell, but just use the lisp
> function format to output a message.
>
> (format t (intl:gettext "incorrect syntax: "))  line 122 of nparse.lisp
>
> followed by some more complex stuff to output the cause of the error,
> here ~ is not an infix operator ...
>
> Since you probably don't want to redefine lisp functions, i don't see
> how to mute this error message.

-- 
---
Best regards,
Dr Butler
_______________________________________________
Maxima-discuss mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/maxima-discuss