[Maxima-bugs] [maxima:bugs] #5715 elliptic_eu incorrect and inaccurate

[Raymond T. <rt...@us...>]

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**[bugs:#5715] elliptic\_eu incorrect and inaccurate**

**Status:** open
**Group:** None
**Labels:** elliptic\_eu 
**Created:** Sun Oct 25, 2026 02:56 PM UTC by Raymond Toy
**Last Updated:** Sun Oct 25, 2026 02:56 PM UTC
**Owner:** nobody


`elliptic_eu` is inaccurate or just incorrect.  Claude found these issues:

Call | Maxima | Correct
---------- | ---------- | ------
elliptic_eu(-0.5, 0.5)	| −2.66111	| −0.48063
elliptic_eu(5.0, 0.5)	| 1.64653	| 3.75604
elliptic_eu(4.0, -2.0)	| 6.69507	| 7.82517
elliptic_eu(-0.5+0.5*%i, 0.5)	| real part −2.715	| −0.5347
elliptic_eu(0.3+5*%i, 0.5)	| imaginary part 4.72	| 2.613


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