.BG
.FN Complex
.FN Re
.FN Im
.FN Mod
.FN Arg
.FN Conj
.TL
Basic Complex Number Manipulation
.CS
Re(z)
Im(z)
Mod(z)
Arg(z)
Conj(z)
.AG z
numeric or complex.  Missing values (`NA's) are allowed.
.RT
vector of real parts (`Re'), imaginary parts (`Im'), modulii (`Mod'),
arguments (`Arg') or complex conjugates (`Conj') of `z'.
The value of `Arg' satisfies `\-pi < Arg(z) <= pi'.
.KW math
.KW complex
.WR
