VMS Help RTL Routines, MTH$, MTH$HATAN2  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Given sine and cosine, the Arc Tangent in Radians (H-Floating
    Value) with Two Arguments routine returns the angle (in radians)
    as an H-floating value whose tangent is given by the quotient of
    sine and cosine (sine/cosine).

    Format

      MTH$HATAN2  h-radians ,sine ,cosine

1 - Returns

    None.

2 - Arguments

 h-radians

    OpenVMS usage:floating_point
    type:         H_floating
    access:       write only
    mechanism:    by reference

    Angle (in radians) whose tangent is specified by (sine/cosine).
    The h-radians argument is the address of an H-floating number
    that is this angle. MTH$HATAN2 writes the address of the angle
    into h-radians.

 sine

    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference

    Dividend. The sine argument is the address of a floating-point
    number that is this dividend. For MTH$HATAN2, sine specifies an
    H-floating number.

 cosine

    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference

    Divisor. The cosine argument is the address of a floating-point
    number that is this divisor. For MTH$HATAN2, cosine specifies an
    H-floating number.