_gen_roots_and_weights(n, mu0, an_func, bn_func, f, df, symmetrize, mu)
Returns the roots (x) of an nth order orthogonal polynomial, and weights (w) to use in appropriate Gaussian quadrature with that orthogonal polynomial.
The polynomials have the recurrence relation
P_n+1(x) = (x - A_n) P_n(x) - B_n P_n-1(x)
an_func(n) should return A_n sqrt_bn_func(n) should return sqrt(B_n) mu ( = h_0 ) is the integral of the weight over the orthogonal interval
[x,w] = gen_roots_and_weights(n,an_func,sqrt_bn_func,mu)
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