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

    Given the hyperbolic tangent of an angle, the Hyperbolic Arc
    Tangent routine returns the hyperbolic arc tangent of that angle.

    Format

      MTH$ATANH  hyperbolic-tangent

      MTH$DATANH  hyperbolic-tangent

      MTH$GATANH  hyperbolic-tangent

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

1 - Returns

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

    The hyperbolic arc tangent of hyperbolic-tangent. MTH$ATANH
    returns an F-floating number. MTH$DATANH returns a D-floating
    number. MTH$GATANH returns a G-floating number.

2 - Argument

 hyperbolic-tangent

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

    Hyperbolic tangent of an angle. The hyperbolic-tangent argument
    is the address of a floating-point number that is this hyperbolic
    tangent. For MTH$ATANH, hyperbolic-tangent specifies an F-
    floating number. For MTH$DATANH, hyperbolic-tangent specifies
    a D-floating number. For MTH$GATANH, hyperbolic-tangent specifies
    a G-floating number.