[R] Equation sequencing

[Stuart Nettleton]

Hello,
Would anyone be able to help me find an algebraic equation sequencer (like  
Knuth's topological processor) that will order a system of equations for  
nonlinear optimization similar to GAMS/AMPL? eg A[t]=A[t-1]+B[t]  with  
perhaps sum(A) to be optimised by changing B[t] and other constraints. I  
imagine that something could be done with mathgraph.
Thanks,
Stuart

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