[Numpy-discussion] yet another indexing question

suppose I have: In [10]: u Out[10]: array([[0, 1, 2, 3, 4], [5, 6, 7, 8, 9]]) And I have a vector v: v = np.array ((0,1,0,1,0)) I want to form an output vector which selects items from u where v is the index of the row of u to be selected. In the above example, I want: w = [0,6,2,8,4] I can't seem to find a syntax that does this. Now, more importantly, I need the result to be a reference to the original array (not a copy), because I'm going to use it on the LHS of an assignment. Is this possible?