6.7.8 Transforming a continued fraction representation into a real: dfc2f
The dfc2f command transforms a continued fraction into a real
number.
dfc2f takes one argument: L, a list representing a continued fraction, which can be:
a list of integers for a rational number.
a list whose last element is a list for an
ultimately periodic representation, i.e.
a quadratic number, that is a root of a second order equation with
integer coefficients.
a list with a remainder r as last element
(a=a0+1/…+1/an+1/r).
dfc2f(L) returns the rational number or the quadratic
number whose continued fraction representation is L.