RoutineName Mark ofIntroduction Purpose D04AAF Example Text 5 nagf_numdiff Numerical differentiation, derivatives up to order 14, function of one real variable D04BAF Example Text 23 nagf_numdiff_rcomm Numerical differentiation, user-supplied function values, derivatives up to order $14$, derivatives with respect to one real variable D04BBF 23 nagf_numdiff_sample Generates sample points for function evaluations by D04BAF