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My question is how to pre-compile the rules1, rules2 and result parts of the following Module code without hard-coding the many (and changing number of) variables and rather complicated equations:

    rules2=Join[rules1, externalrules/.rules1];
    rules3=Join[rules2, externalfunction[externalvars2/.rules2]];

Thanks. (PS I have studied Mathematica's Compile tutorial and Rob Knapp's 2011 Presentation)

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You will need to supply all relevant definitions, including the rules. At the moment, your question is unclear. – Yves Klett Jul 9 '14 at 6:27
Dispatch[rules] might be what you are looking for. – Stephen Luttrell Jul 9 '14 at 10:28
Thanks Yves and Stephen, I will investigate further – stuartn Jul 11 '14 at 3:39

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