y = _bspleval(xx,xk,coef,k,{deriv (0)})
Extra knot points are internally added using knot-point symmetry around xk[0] and xk[-1]
The spline is defined by the approximation interval xk[0] to xk[-1], the length of xk (N+1), the order of the spline, k, and the number of coeficients N+k. The coefficients range from xk_{-K} to xk_{N-1} inclusive and are all the coefficients needed to define an arbitrary spline of order k, on the given approximation interval
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All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them