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| From: | Francisco |
| Subject: | [Octave-bug-tracker] [bug #60055] regarding to bug #15872: atanh branch cut strangeness |
| Date: | Mon, 15 Feb 2021 10:32:54 -0500 (EST) |
| User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36 Edg/88.0.705.68 |
Follow-up Comment #3, bug #60055 (project octave):
What I expect about atanh(3) is the principal value (ppv) of it.
As in sqrt(4) = 2 (is the ppv).
The extension to values outside -1<x<1 is in the context of complex variables.
And this is why log a/b does not not give the ppv when using to define atanh.
The real explanations is that octave seeks to be Matlab-compatible.
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