Function: contfrac
Section: number_theoretical
C-Name: contfrac0
Prototype: GDGD0,L,
Help: contfrac(x,{b},{lmax}): continued fraction expansion of x (x
 rational,real or rational function). b and lmax are both optional, where b
 is the vector of numerators of the continued fraction, and lmax is a bound
 for the number of terms in the continued fraction expansion

