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[Octave-bug-tracker] [bug #44280] atan, atand have different phase from
[Octave-bug-tracker] [bug #44280] atan, atand have different phase from other SW when outside principal branch.
Tue, 17 Feb 2015 16:12:43 +0000
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)
Update of bug #44280 (project octave):
Summary: asin, asind, atan, and atand may have incorrect
values => atan, atand have different phase from other SW when outside
Follow-up Comment #3:
Thanks. This has already been partially addressed in the development branch
that will be released as Octave 4.0 within the next month or so. The NEWS
** The trigonometric functions asin and acos return different phase values
from previous versions of Octave when the input is outside the principal
branch ([-1, 1]). If the real portion of the input is greater than 1
the limit from below is taken. If the real portion is less than 1 then
limit from above is taken. This criteria is consistent with several
numerical analysis software packages.
However, I do note that atan (and by extension atand), do not produce the same
phase. Re-titling the bug report to reflect this remaining issue.
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