You can kill the output label if you wish. But probably not in the
process of returning.
Robert Dodier wrote:
> On 10/4/09, Richard Hennessy <rich.hennessy at verizon.net> wrote:
>
>
>> It would be nice and necessary also that no output label would be created if
>> the function returns nothing. So in this case if f(9)
>> would get an output label created but f(-9) would get no output label. All
>> operations attempting to operate on the return value of
>> nothing would also cause a lisp error.
>>
>
> Well, there exists the symbol und which represents "undefined".
> Maxima doesn't handle it consistently, however.
> E.g. und - und => 0 (oops!)
>
> best
>
> Robert Dodier
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