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| Date: Tue, 4 Jan 2005 18:21:49 -0800 (PST) | From: bear <bear@xxxxxxxxx> | | On Tue, 4 Jan 2005, Bradd W. Szonye wrote: | | Thus, our 5x4x3x2 array could be written | | #5*4*3*2A(...) | or | #5*4*3*2A<typespec>(...) | | or similar. I think this is better enough in terms of being able | to express zero-size dimensions, enhanced human-readability and | maintainability that I wouldn't object to the increased | verbosity. It is not compatible with the CL prior art, but makes up | for it by being dog-easy to understand. It does look readable. There are several variations possible: #<dim1>*<dim2>*...A (...) #2*3A ((a b c) (d e f)) #<dim1>*<dim2>*...A:<type> (...) #2*3A:fixi-8 ((-1 0 1) (1 0 1)) #A<dim1>*<dim2>*... (...) #A2*3 ((a b c) (d e f)) #A<dim1>*<dim2>*...:<type> (...) #A2*3:fixn-16 ((2 0 1) (5 4 2)) #<rank>A<dim1>*<dim2>*... (...) #2A2*3 ((0 1 2) (d e f)) #<rank>A<dim1>*<dim2>*...:<type> (...) #2A2*3:fixn-8 ((0 1 2) (3 4 5)) #<rank>A (...) #2A ((a b) (c d)) #<rank>A:<type> (...) #2A:fixi-16 ((-1 0) (0 1)) Notice that all but the first example pair are unambiguous with each other; and Common-Lisp arrays would be compatible when input. For output, one of the middle forms would be used. | >Specifying the dimensions also permits a convenient shorthand for | >repetitive arrays: If there aren't enough elements for a | >dimension, simply repeat the last element. For example, #100(1) is | >shorthand for #(1 1 1 1 ... 1) | | True that. I think I like this idea better than the current | proposal.