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From: | anónimo |
Subject: | [Octave-bug-tracker] [bug #60055] regarding to bug #15872: atanh branch cut strangeness |
Date: | Sun, 14 Feb 2021 12:50:36 -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 |
URL: <https://savannah.gnu.org/bugs/?60055> Summary: regarding to bug #15872: atanh branch cut strangeness Project: GNU Octave Submitted by: None Submitted on: dom 14 feb 2021 17:50:34 UTC Category: Octave Function Severity: 3 - Normal Priority: 5 - Normal Item Group: Inaccurate Result Status: None Assigned to: None Originator Name: Francisco Originator Email: frp7000@gmail.com Open/Closed: Open Release: 6.1.0 Discussion Lock: Any Operating System: Microsoft Windows _______________________________________________________ Details: I think the principal value (ppv) of atanh is atanh(z)= 0.5*(log(1+z) -log(1-z)). This is the value used in fortran and Mathematica. We cannot use atanh(z) = 0.5*log((1+z)/(1-z)) this won't give the ppv. Octave reports for instance, atanh (3) = 0.34 + i pi/2 Which is not the ppv. _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?60055> _______________________________________________ Mensaje enviado vía Savannah https://savannah.gnu.org/
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