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atan2
Quadrant correct inverse circular tangent.SYNOPSIS:
double x, y, z, atan2();
z = atan2(y, x);
DESCRIPTION:
Returns the radian angle whose tangent is y/x.
Define compile time symbol ANSIC = 1 for ANSI standard, range -PI < z <= +PI, args (y,x);
else ANSIC = 0 for range 0 to 2PI, args (x,y).
ACCURACY:
Relative error:
arithmetic domain # trials peak rms
IEEE -10, 10 10^6 2.5e-16 6.9e-17