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

[Michael Godfrey]

Follow-up Comment #9, bug #37379 (project octave):

The GNU libc doc says:

The math library normally defines M_PI to a double approximation of pi. If
strict ISO and/or POSIX compliance are requested this constant is not defined,
but you can easily define it yourself:

     #define M_PI 3.14159265358979323846264338327
==========================

Do we do this?

Also, the GNU doc says:
            The arc cosine function is defined mathematically only over the
domain -1 to 1. If x is outside the domain, acos signals a domain error. 

And similar for other inverse functions.  Octave currently does not return an
error.  Instead it returns a complex result.
This is also Matlab behaviour.  Should we adhere to the GNU
spec?



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