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Compare arrays of tuples and return the different element and the index
f#

Dear All:

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#light

let a1 = [| (1, 1); (2, 1); (3, 1) |]

let a2 = [| (1, 1); (2, 3); (3, 1) |]

let aa = Array.zip a1 a2
       |> Array.filter(fun (x, y) -> x <> y)

I want to write a function to do this: it will return the different tuple from two arrays, but I also want to return the index of the different tuple in the second array and the corresponding tuple in the second array. (My code did NOT totally work yet!)
For my above example, I want to return: 1 and (2, 3)

Another example:

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let a1 = [| (1, 1); (2, 1); (3, 1); (4, 1) |]

let a2 = [| (1, 1); (2, 3); (3, 1); (4, 2) |]

I want to return: 1 and (2, 3); 3 and (4, 2)
If you have any idea, please show me your code.
Besides, I am not used to the new place for F#, the format makes me feel difficult to find a good place to post my questions, therefore, I still post my question here.
Thanks for your help!

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let giveMeAName source1 source2 =
    Seq.zip source1 source2
    |> Seq.mapi (fun index (elem1, elem2) -> (index, (elem1, elem2))) // could be replaced by (fun index tuple -> (index, tuple))
    |> Seq.filter (fun (_, (elem1, elem2)) -> elem1 <> elem2)
    |> Seq.map (fun (index, (_, elem2)) -> (index, elem2))

let a1 = [| (1, 1); (2, 1); (3, 1); (4, 1) |]
let a2 = [| (1, 1); (2, 3); (3, 1); (4, 2) |]

giveMeAName a1 a2;; //seq [(1, (2, 3)); (3, (4, 2))]
By on 10/26/2011 8:00 PM ()

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