"mary" <mary.stern at virgin.net> wrote in message news:9c6laa$2f9q$1 at sp15at20.hursley.ibm.com... [snip] > # --- take vertical slices of x (in y-order) > z = map(None, x[y[0]], x[y[1]], x[y[2]]) <---How do I map(None, * [x[yy] for yy in y] ) Alex