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Herr Buttner, Can you tell me how I might remove my name from this waste of my time mailing list? -----Original Message----- From: Per Bothner [mailto:per@xxxxxxxxxxx] Sent: Tuesday, November 13, 2001 9:44 AM To: srfi-25@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Subject: should allow empty arrays > The lower bound b and the upper bound e of a dimension are exact integers with |(<= b e)|. This should be (<= b (- e 1)) if you believe in APL, which has "always" allowed 0-element arrays. So does Common Lisp. I think we should too, If you allow 0 in a dimension it may be more convenient to represent a shape as: (list of length), (list of lower-bound) instead of: list of (lower-bound, upper-bound) use: (list of length), (list of lower-bound) I.e. instead of the shape being (0 2 0 3) it would be ((0 0) (3 4)). One option for the shape function would be: (shape lower-bound length ...) where lower-bound is either a list or an integer. The latter is short-hand for a list where all lower bounds are the same. One main advantage of this is that you normally don't need explicit calls to list: (shape 0 3 4) yields ((0 0) (3 4)). --Per Bothner