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How to parse equations

  • To: mathgroup at
  • Subject: [mg91621] How to parse equations
  • From: "Stuart Nettleton" <Stuart.Nettleton at>
  • Date: Fri, 29 Aug 2008 04:25:10 -0400 (EDT)
  • Organization: University of Technology, Sydney

I am a bit stuck on how to convert the following set of equations to a  
list of variables:
eqns = {
    x[1] + y[1] + z[1],
    x[1] + 3 z[1] + u[1]^2,
    z[1] - u[1] - 16,
    u[1] - 5};
to give..
{{ x[1], y[1], z[1]},{x[1], z[1], u[1]},{z[1], u[1],}, {u[1]}}
Any thoughts would be appreciated!

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