VMS Help RTL Routines, MTH$, MTH$xLOG2  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Base 2 Logarithm routine returns the base 2 logarithm of the
    input value specified by floating-point-input-value.

    Format

      MTH$ALOG2  floating-point-input-value

      MTH$DLOG2  floating-point-input-value

      MTH$GLOG2  floating-point-input-value

      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 base 2 logarithm of floating-point-input-value. MTH$ALOG2
    returns an F-floating number. MTH$DLOG2 returns a D-floating
    number. MTH$GLOG2 returns a G-floating number.

2 - Argument

 floating-point-input-value

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

    The input value. The floating-point-input-value argument is the
    address of a floating-point number that is this input value. For
    MTH$ALOG2, floating-point-input-value specifies an F-floating
    number. For MTH$DLOG2, floating-point-input-value specifies a
    D-floating number. For MTH$GLOG2, floating-point-input-value
    specifies a G-floating number.