Creating an array from 2 other arrays

2011 2 16
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I need a code that will do the following: Given an array X and another array Y which is smaller than X and every element in Y exists in X, I need to create a third array Z which consists of every element that is in X and NOT in Y.
For example, if X = [1 2 3 4 5] and Y = [1 2 3] then I want the code to return an array Z = [4 5].
Can anyone help write this code for me? I've been trying to do it using the 'find' function but can't get it to work. Thanks for the help.

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Matt Fig
Matt Fig 2011-2-16

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Z = setdiff(X,Y)
or (just for fun):
Z = X(~ismember(X,Y))

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