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MathGroup Archive 2007

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Re: Parse results from Solve

  • To: mathgroup at
  • Subject: [mg73908] Re: Parse results from Solve
  • From: "Norbert Marxer" <marxer at>
  • Date: Sat, 3 Mar 2007 00:55:34 -0500 (EST)
  • References: <es916i$2u2$>

On 2 Mrz., 12:18, nikki_74 <namratashe... at> wrote:
> I have used the Solve command to get the solutions for a system of equations. However I want to use these solutions in other commands, such as Reduce and Simplify.
> For instance, say the output of Solve is,
> sols= {{x->0,y->0},{x->1,y->2}}
> and I want all solutions where x!=y , or , all solutions where y>1.
> Can anybody help with this? Thanks!


You can use

sols = {{x -> 0, y -> 0}, {x -> 1, y -> 2}};
Cases[sols, {x -> xv_, y -> yv_} /; xv != yv]
Cases[sols, {x -> xv_, y -> yv_} /; yv > 1]

Best Regards
Norbert Marxer

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