def atan()

in rtl/log/luts/FixedPoint.py [0:0]

• 22 lines of code
• 7 McCabe index (conditional complexity)

    def atan(self):
        """Compute inverse-tangent of given number (as angle in radians)"""
        reflect = False
        recip = False
        double = False
        tan = self
        if tan < 0:
            tan *= -1
            reflect = True
        if tan > 1:
            tan = 1 / tan
            recip = True
        if tan > 0.414:
            tan = ((1 + tan * tan).sqrt() - 1) / tan
            double = True
        ang = tan._rawarctan()
        if double:
            ang *= 2
        if recip:
            ang = self.family.pi / 2 - ang
        if reflect:
            ang *= -1
        return ang