Computes the complete partial fraction expansion of Fz over the complex numbers.

The denominator of Fz is factored using factor. Any factors that are polynomials of degree 2 are then factored over the complex numbers. Any factors that are polynomials of degree greater than 2 are represented in factored form using Sum and RootOf expressions.

If the optional argument 'no_RootOf' is used, the denominator will be completely factored over the complex numbers. If the denominator cannot be factored, an inert Pfrac expression is returned.

The global variables _J and _R are used in the RootOf expressions.

The command with(genfunc,rgf_pfrac) allows the use of the abbreviated form of this command.