ArcTan(x,y)?

[StephenG1CMZ]

(04-05-2017 10:41 PM)KeithB Wrote:  So if the limit of atan2(x,x) as x approaches 0 is 45, maybe that is what atan2() should return?

Clearly, discontinuities near 0 cannot be avoided - I have even seen it suggested online that one could scale values and use integer arithmetic to work around. I am beginning to wonder whether returning an error might be useful. But many Atan2 implementations do return 0, so changing to return 45 instead would introduce compatibility issues.