Computes the Gauss hypergeometric function 2F1(a,b,c,x) = F(a,b,c,x) for |x|< 1. If the arguments (a,b,c,x) are too close to a singularity then the function can return the error code GSL_EMAXITER when the series approximation converges too slowly. This occurs in the region of x=1, c - a - b = m for integer m.
err contains an estimate of the absolute error in the value z.
This function is from the GNU Scientific Library, see http://www.gnu.org/software/gsl/ for documentation.
Package: gsl