Platform | x64, Win32, .NET |

Purpose |
To get the Arctangent (inverse tangent) from the arguments. |

Class |
Elemental function. |

Syntax |
REAL FUNCTION ATAN2(Y,X) |

Description |
(X, Y) are cartesian coordinates and the result is the value of Arctangent(Y/X). If Y>0, the result is positive. If Y=0, the result is zero if X>0 and p if X<0. If Y<0, the result is negative. If X=0, the absolute value of the result is p/2. The arguments must not both have the value zero. |

Return value |
The result is given in radians in the range -
p < |

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