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(g77-295.info)ATan2 Intrinsic

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ATan2 Intrinsic
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     ATan2(Y, X)

ATan2: `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

Y: `REAL'; scalar; INTENT(IN).

X: `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the arc-tangent (inverse tangent) of the complex number (Y,
X) in radians.

   Note: Tan Intrinsic, for the inverse of this function.