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

[Michael Godfrey]

Follow-up Comment #14, bug #37379 (project octave):

Below is a try at making atan2 more compatible
with the other trig functions, which allow complex
arguments.  This needs more checking, and maybe
it should really be in C?

++
function res = atan2(y, x)

% Test for special cases and quadrants.
  if(x == 0)
    if(y > 0)
      res = pi/2;
    elseif (y < 0)
      res = -pi/2;
    else
      res = NaN;
    endif
    return;
  endif
  res = atan(y/x);
  if(x < 0)
    if(y >= 0)
      res = res + pi;
    else
      res = res - pi;
    endif
  endif
  return;
endfunction


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