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Set Intersection Function (ML)

 
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Set Intersection Function (ML)
wingz198
26 Nov, 2007 - 10:45 AM
Post #1

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I'm writing a function that takes in a list of lists and returns the intersection. I think I've got the code doing what it's supposed to, but when I run it with input it gives me uncaught exception empty and I can't figure out why. Here's the code for the main function:
CODE
fun
    multiSetIntersection([]) = []
    | multiSetIntersection(list) = if findNumber(tl(list),hd(hd(list))) = true
                    then if tl(list) = nil then [] else hd(hd(list))::multiSetIntersection(tl(hd(list))::tl(list))
                    else if hd(list)=nil then []
                        else multiSetIntersection( tl(hd(list))::tl(list));
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