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

    Given the tangent of an angle, the Arc Tangent in Degrees routine
    returns that angle (in degrees).

    Format

      MTH$ATAND  tangent

      MTH$DATAND  tangent

      MTH$GATAND  tangent

      Each of the above formats accepts one of the floating-point
      types as input.

1 - Corresponding JSB Entry Points

      MTH$ATAND_R4

      MTH$DATAND_R7

      MTH$GATAND_R7

      Each of the above JSB entry points accepts one of the floating-
      point types as input.

2 - Returns

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_floating
    access:       write only
    mechanism:    by value

    Angle in degrees. MTH$ATAND returns an F-floating number.
    MTH$DATAND returns a D-floating number. MTH$GATAND returns a
    G-floating number.

3 - Argument

 tangent

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_floating
    access:       read only
    mechanism:    by reference

    The tangent of the angle whose value (in degrees) is to be
    returned. The tangent argument is the address of a floating-point
    number that is this tangent. For MTH$ATAND, tangent specifies an
    F-floating number. For MTH$DATAND, tangent specifies a D-floating
    number. For MTH$GATAND, tangent specifies a G-floating number.