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Re: How to parse equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg91642] Re: [mg91621] How to parse equations
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sat, 30 Aug 2008 01:52:49 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

Use Variables

eqns = {x[1] + y[1] + z[1], x[1] + 3 z[1] + u[1]^2, z[1] - u[1] - 16, 
   u[1] - 5};

Variables /@ eqns

{{x(1),y(1),z(1)},{u(1),x(1),z(1)},{u(1),z(1)},{u(1)}}


Bob Hanlon

---- Stuart Nettleton <Stuart.Nettleton at uts.edu.au> wrote: 

=============
Hi,
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!
Thanks,
Stuart

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