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I have been working on this all day and developed it to here: % Load in the tube file. :-[tube]. % route takes a starting location'X' and a destination 'Z'. % Creates an empty list and calls getroute. route(X,Z):- getroute(X,Z,[X]). % getroute takes a starting location 'X'...

I don't understand what your attempting. You want: minus(A,B) Where both A and B are lists? And then it prints out what you would have to take away from A to get to B?

I have been playing with the code and I believe this should work, but it fails in exactly the same way as my last post: % Load in the tube file. :-[tube]. % route takes a starting location'X' and a destination 'Z'. % Creates an empty list 'V' and calls getroute. route(X,Z):- V...

This is what I have intended to do. But adding a list to my code seems to break it. Just slowly implementing this, I haven't added the code to add stations into the list, just pass the list around: route(X,Z):- V = [], getroute(X,Z,V). getroute(X,Z,V) :-...

I have a file containing how stations in the London underground are linked. For example: % CIRCLE LINE connected(high_st_kensington,notting_hill_gate,circle). connected(notting_hill_gate,bayswater,circle). % NORTHERN LINE (left branch) connected(mornington_crescent,euston,northern_l)...