The current documentation says that atan2(y,x) is the angle between the x-axis
and the vector from the origin to (x,y), but what does this mean when x & y are
complex? The function seems to pick theta with Re(theta) between -pi and pi and
with tan(theta) (approximately) equal to y/x, but that le
Details in documentation: "All of ‘weights’, ‘subset’, ‘offset’, ‘etastart’ and
‘mustart’ are evaluated in the same way as variables in ‘formula’, that is
first in ‘data’ and then in the environment of ‘formula’."
In fact, `data` is usually not an environment, and I have not seen arguments
evalu
