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  % % lagrange  computes Lagrange polynomial for given % interpolation points % % input: % x  vector of interpolation points x0, x1,..., xn % j  index of Lagrange polynomial L_{n,j}(x) to compute. 
  % the numerator is (xx0)(xx1)...(xxn), where the factor % (xxj) is excluded, which means the numerator is a % polynomial whose roots are x0, x1,..., xn except xj. 
  % the roots function returns the coefficients of a % polynomial that has the given roots. 
 www.stanford.edu /~lambers/math105a/code/lagrange.m (315 words) 
