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Using and Porting GNU Fortran

8.11.9.25 ATan Intrinsic

ATan(X)

ATan: REAL function, the `KIND=' value of the type being that of argument X.

X: REAL; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

Returns the arc-tangent (inverse tangent) of X in radians.

See section 8.11.9.243 Tan Intrinsic, for the inverse of this function.