[Maxima-bugs] [maxima:bugs] Re: #4636 signum(ind) is an error

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

Not sure when this code got in here:
   ($expand (div x (ftake 'mexpt (add (mul re re) (mul im im)) 1//2)) 1 0))
but that seems like a silly way to handle the real case (and makes the rest of the code unnecessary for real numerical inputs). Presumably this should not be used when im=0.


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**[bugs:#4636] signum(ind) is an error**

**Status:** open
**Group:** None
**Labels:** extended real signum limit 
**Created:** Thu Nov 27, 2025 12:41 PM UTC by Barton Willis
**Last Updated:** Fri Nov 28, 2025 01:01 PM UTC
**Owner:** nobody


Either a  `signum` nounform or `ind` is a better result than an error:
~~~
(%i4)	signum(ind);
sign: sign of ind is undefined.
~~~
Should the general simplifier, or the one‑argument limit function, handle` F(extended-real)`? We’ve discussed this—do we have a consensus?



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