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From: | Markus Mützel |
Subject: | [Octave-bug-tracker] [bug #60055] regarding to bug #15872: atanh branch cut strangeness |
Date: | Mon, 15 Feb 2021 12:28:18 -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 #5, bug #60055 (project octave): AFAIU, there is no "one principal value" of atanh. But it's possible to define a principal value that best fits ones needs. See e.g. [1]. While Wikipedia is no standardization source, they do describe the principal value that Octave chose to use (to be compatible with Matlab) first. The definition you propose is described second as being used by "some authors". [1]: https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions#Principal_values_of_the_inverse_hyperbolic_tangent_and_cotangent _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?60055> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
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