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Question: Dynamic assignment of ranking of variables in DifferentialThomas

Question:Dynamic assignment of ranking of variables in DifferentialThomas

Steven_Huang 110 Maple
dsolve ranking list indexed
47 minutes ago
0

So the problem I encountered is when I try to assign ranking of variables of ODE in ThomasDecomposition, the indexed variables are not allowed. For instance, for an ODE system containing a[0], a[1], a[2] as dependent variables, if I assign:
R := Ranking([x],[a[0],a[1],a[2]])
It throws an error: due to efficiency reasons no variables of type "indexed" are allowed in the list of depended variables NULL;
This is going to be inconvenient when I have to dynamically solve ODE system within a function call, especially when the system is nonlinear and algebraically closed(no integration constants in solutions) and calling DifferentialThomas in dsolve will be slow. I want to know how to resolve this.
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