[Octave-bug-tracker] [bug #44280] atan, atand have different phase from other SW when outside principal branch.

[Rik]

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
principal branch.

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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
file reads


 ** 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
then
    the limit from below is taken.  If the real portion is less than 1 then
the
    limit from above is taken.  This criteria is consistent with several
other
    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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