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

 complex-natural-log

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

    Natural logarithm of the complex number specified by complex-
    number. The complex natural logarithm routines that have D-
    floating complex and G-floating complex input values write the
    address of the complex natural logarithm into complex-natural-
    log. For MTH$CDLOG, the complex-natural-log argument specifies a
    D-floating complex number. For MTH$CGLOG, the complex-natural-log
    argument specifies a G-floating complex number.

 complex-number

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

    Complex number whose complex natural logarithm is to be returned.
    This complex number has the form (r,i), where r is the real part
    and i is the imaginary part. The complex-number argument is the
    address of this complex number. For MTH$CDLOG, complex-number
    specifies a D-floating number. For MTH$CGLOG, complex-number
    specifies a G-floating number.