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Asked: 2026-05-27T09:58:39+00:00

I am trying to replicate Lagrange Interpolating Polynomials in Mathematica. The wiki for an

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I am trying to replicate Lagrange Interpolating Polynomials in Mathematica. The wiki for an explanattion of them can be seen here. This is my code (sorry I don’t know how to place mathematica code in SO so I have an image):
mathematica error
My problem is that I want a conditional product. if j = m I just want to skip over that product and evaluate the next one. That’s why I put the false evaluation as 1. Any suggestions?

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1 Answer

  1. Editorial Team

    All built-in functions start with a capital letter. So the conditional is If[...] not if[...]. Fix that and everything works fine!

    With[{k = 5}, Sum[Product[
  If[j != m, (x - x[m])/(x[j] - x[m]), 1], {m, 0, k}], {j, 0, k}]]

    enter image description here

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