Re: optional argument in foreign calls

[<Joe...@t-...>]

Sam,

https://pari.math.u-bordeaux.fr/dochtml/html/Arithmetic_functions.html

"The library syntax is GEN gp_factor0(GEN x, GEN lim = NULL).
This function should only be used by the gp interface.
Use directly GEN factor(GEN x) or GEN boundfact(GEN x, ulong lim)."

I don't know what the "gp interface" is. Yet to me it seems like there are 2 low-level
functions, factor/1 and boundfact/2. Perhaps gp is a high-level shell that gives
the user the illusion of a single function with optional parameters.

Regards,
	Jörg