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

    The Complex Absolute Value routine returns the absolute value of
    a complex number (r,i).

    Format

      MTH$CABS  complex-number

      MTH$CDABS  complex-number

      MTH$CGABS  complex-number

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

1 - Returns

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

    The absolute value of a complex number. MTH$CABS returns an F-
    floating number. MTH$CDABS returns a D-floating number. MTH$CGABS
    returns a G-floating number.

2 - Argument

 complex-number

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

    A complex number (r,i), where r and i are both floating-point
    complex values. The complex-number argument is the address of
    this complex number. For MTH$CABS, complex-number specifies
    an F-floating complex number. For MTH$CDABS, complex-number
    specifies a D-floating complex number. For MTH$CGABS, complex-
    number specifies a G-floating complex number.