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Getting an error now: 8 ?- buy(X, L). ERROR: >/2: Arguments are not sufficiently instantiated And the code looks like this now. kopa(X, [ingredient(_,_)|TS], R) :- kopa(X, [ingredient(_,_)|TS], R).

Sorry but it wont work :( The task is to show everything I need to buy to cook for exempel rise. The code: buy(X, L) :- at_home(YS), recipe(X,XS), kollabuy(XS, YS, L). kollabuy([], _, []). kollabuy([X|XS], YS, L1) :- kollabuy(XS, YS, L), kopa(X, YS, R), ( R = [], L1 = L, ! ; L1 = [R | L])...

Okey, so how is it supposed to be in the code?

But R is supposed to be the answer?

Kollabuy is only there to look if any more ingredients need to be checked? And it is doing it in a recurive way? Aint I correct?

Thanks for reply, but I'm not getting it to work :/ buy(X, L) :- at_home(YS), recipe(X,XS), kollabuy(XS, YS, L). kollabuy([], _, _). kollabuy([X|XS], YS, L) :- kopa(X, YS, L), kollabuy(XS, YS, L). %No : when the homelist is empty, you have not foud the ingredient, you need to buy it and know...

I have write a program in Prolog, that will look in a list of ingredients and compare if you need to buy or what you can cook with all the ingredients you got home. I have finish the first one that looks if I can cook for example rise. But I need to write a program that calculate how much I...