Attaching a specific value to a set of numbers

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hi there, Say I have an array that consist of integer numbers 1 to 15. x = [1;3;5;6;15;9;8;10;11;13;12;14;7;2]. Notice that they are not in order. i want to attach a specific value to a set of numbers in the array. ex: if values 1,2,6,7,8 occur i want this value to be replaced with 1 if value 3,5,9,11,13 occur i want this value to be replaced with 2. the left over with a value 3.

I know of one way to do this. I can set an if statement for each value 1to15 but that's just not productive. is there a way i can set up a case statement maybe. any help would be appreciated. thank you. regards, SN