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

[Barton W. <wil...@us...>]

I inserted the code  `($expand (div x ... ) 1 0)`. I didn't like it too much, but it I did it to avoid a check if the imaginary part was zero and make sure that the complex number case returns a number in rectangular form.  

I'll revise this bit of code.


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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 01:14 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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