LagrangeBasis(k,nodes,x) = w[k]*prod(x-nodes[j], j<>k) defines the th Lagrange polynomial of degree  which is either  or  on the given nodes. By convention, the nodes are indexed from , so , and the barycentric weights  are defined as .

At present, this can only be evaluated in Maple by prior use of the object-oriented representation obtained by  and subsequent call to , which uses the numerically stable barycentric form to evaluate the polynomial .