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all possible combinations from an array
Collections (Arrays and Hashes) in Ruby example from a Well House Consultants training course
More on Collections (Arrays and Hashes) in Ruby [link]
Source code: tessa Module: R107
# all possible combinations from an array
# two way combinations # -------------------- stops = ["Swindon","Chippenham","Melksham","Trowbridge","Westbury","Dilton Marsh","Warminster","Salisbury"] puts "From, to ..." routes = 0 for flow in stops.combination(2) p flow p flow.reverse routes += 2 end puts "A total of #{routes} different journeys" # All three way combinations # -------------------------- # start with routes above, adding "back to where you started" # a-b-a and b-a-b style puts "\nStart at, visit, end at" for flow in stops.combination(3) p flow routes += 6 end puts "A total of #{routes} different trips when re-ordered too" puts "and with a-b-a style round trips included" # Have show a-b-c. Other 5 of 6 are c-b-a ... # and b-a-c, c-a-b, a-c-b and b-c-a ? __END__ munchkin:chruby grahamellis$ ruby tessa From, to ... ["Swindon", "Chippenham"] ["Chippenham", "Swindon"] ["Swindon", "Melksham"] ["Melksham", "Swindon"] ["Swindon", "Trowbridge"] ["Trowbridge", "Swindon"] ["Swindon", "Westbury"] ["Westbury", "Swindon"] ["Swindon", "Dilton Marsh"] ["Dilton Marsh", "Swindon"] ["Swindon", "Warminster"] ["Warminster", "Swindon"] ["Swindon", "Salisbury"] ["Salisbury", "Swindon"] ["Chippenham", "Melksham"] ["Melksham", "Chippenham"] ["Chippenham", "Trowbridge"] ["Trowbridge", "Chippenham"] ["Chippenham", "Westbury"] ["Westbury", "Chippenham"] ["Chippenham", "Dilton Marsh"] ["Dilton Marsh", "Chippenham"] ["Chippenham", "Warminster"] ["Warminster", "Chippenham"] ["Chippenham", "Salisbury"] ["Salisbury", "Chippenham"] ["Melksham", "Trowbridge"] ["Trowbridge", "Melksham"] ["Melksham", "Westbury"] ["Westbury", "Melksham"] ["Melksham", "Dilton Marsh"] ["Dilton Marsh", "Melksham"] ["Melksham", "Warminster"] ["Warminster", "Melksham"] ["Melksham", "Salisbury"] ["Salisbury", "Melksham"] ["Trowbridge", "Westbury"] ["Westbury", "Trowbridge"] ["Trowbridge", "Dilton Marsh"] ["Dilton Marsh", "Trowbridge"] ["Trowbridge", "Warminster"] ["Warminster", "Trowbridge"] ["Trowbridge", "Salisbury"] ["Salisbury", "Trowbridge"] ["Westbury", "Dilton Marsh"] ["Dilton Marsh", "Westbury"] ["Westbury", "Warminster"] ["Warminster", "Westbury"] ["Westbury", "Salisbury"] ["Salisbury", "Westbury"] ["Dilton Marsh", "Warminster"] ["Warminster", "Dilton Marsh"] ["Dilton Marsh", "Salisbury"] ["Salisbury", "Dilton Marsh"] ["Warminster", "Salisbury"] ["Salisbury", "Warminster"] A total of 56 different journeys Start at, visit, end at ["Swindon", "Chippenham", "Melksham"] ["Swindon", "Chippenham", "Trowbridge"] ["Swindon", "Chippenham", "Westbury"] ["Swindon", "Chippenham", "Dilton Marsh"] ["Swindon", "Chippenham", "Warminster"] ["Swindon", "Chippenham", "Salisbury"] ["Swindon", "Melksham", "Trowbridge"] ["Swindon", "Melksham", "Westbury"] ["Swindon", "Melksham", "Dilton Marsh"] ["Swindon", "Melksham", "Warminster"] ["Swindon", "Melksham", "Salisbury"] ["Swindon", "Trowbridge", "Westbury"] ["Swindon", "Trowbridge", "Dilton Marsh"] ["Swindon", "Trowbridge", "Warminster"] ["Swindon", "Trowbridge", "Salisbury"] ["Swindon", "Westbury", "Dilton Marsh"] ["Swindon", "Westbury", "Warminster"] ["Swindon", "Westbury", "Salisbury"] ["Swindon", "Dilton Marsh", "Warminster"] ["Swindon", "Dilton Marsh", "Salisbury"] ["Swindon", "Warminster", "Salisbury"] ["Chippenham", "Melksham", "Trowbridge"] ["Chippenham", "Melksham", "Westbury"] ["Chippenham", "Melksham", "Dilton Marsh"] ["Chippenham", "Melksham", "Warminster"] ["Chippenham", "Melksham", "Salisbury"] ["Chippenham", "Trowbridge", "Westbury"] ["Chippenham", "Trowbridge", "Dilton Marsh"] ["Chippenham", "Trowbridge", "Warminster"] ["Chippenham", "Trowbridge", "Salisbury"] ["Chippenham", "Westbury", "Dilton Marsh"] ["Chippenham", "Westbury", "Warminster"] ["Chippenham", "Westbury", "Salisbury"] ["Chippenham", "Dilton Marsh", "Warminster"] ["Chippenham", "Dilton Marsh", "Salisbury"] ["Chippenham", "Warminster", "Salisbury"] ["Melksham", "Trowbridge", "Westbury"] ["Melksham", "Trowbridge", "Dilton Marsh"] ["Melksham", "Trowbridge", "Warminster"] ["Melksham", "Trowbridge", "Salisbury"] ["Melksham", "Westbury", "Dilton Marsh"] ["Melksham", "Westbury", "Warminster"] ["Melksham", "Westbury", "Salisbury"] ["Melksham", "Dilton Marsh", "Warminster"] ["Melksham", "Dilton Marsh", "Salisbury"] ["Melksham", "Warminster", "Salisbury"] ["Trowbridge", "Westbury", "Dilton Marsh"] ["Trowbridge", "Westbury", "Warminster"] ["Trowbridge", "Westbury", "Salisbury"] ["Trowbridge", "Dilton Marsh", "Warminster"] ["Trowbridge", "Dilton Marsh", "Salisbury"] ["Trowbridge", "Warminster", "Salisbury"] ["Westbury", "Dilton Marsh", "Warminster"] ["Westbury", "Dilton Marsh", "Salisbury"] ["Westbury", "Warminster", "Salisbury"] ["Dilton Marsh", "Warminster", "Salisbury"] A total of 392 different trips when re-ordered too and with a-b-a style round trips included munchkin:chruby grahamellis$ Learn about this subject
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