here is m-files for tsp problem .it is well written with good descriptions.and works even for large number of nodes.

TSP via Ants Colony\ants_cost.m
...................\ants_cycle.m
...................\ants_information.m
...................\ants_primaryplacing.m
...................\ants_traceupdating.m
...................\main.m
TSP via Ants Colony

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