[Octave-bug-tracker] [bug #37379] atan2 and other trig functions lack documentation

[Michael Godfrey]

Follow-up Comment #13, bug #37379 (project octave):

I have looked at this a bit more.  The single
argument trig and inverse trig functions appear
to follow Kahan for complex arguments.  This
differs from (extends) the ISO/IEC definitions
for reals (with +- 0).  However, atan2 does not
do this.  Thus, for complex arguments
atan2(y,x) != atan(y/x) despite the help doc which
says that it is.  atan2 does not accept complex
arguments.

Maybe atan2(y,x) should correctly preserve the
signs of y and x and use atan?

I will look more at how Maple does this.

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