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Article #202Re: Nested arrays
From: moews_2
Date: Fri, 23 May 1986 04:05
Date: Fri, 23 May 1986 04:05
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1641 bytes
In article <834@bentley.UUCP> kwh@bentley.UUCP (KW Heuer) writes: >... > >I find this one easiest to understand. Enclose always returns a scalar of >(new) type "tree"; arrays are still homogeneous but the scalars in a tree >array may disclose to any object; the "standard scalar" of type tree (the >filler value for overtake or expand, corresponding to numeric zero and >character blank) is the enclosure of an empty tree. This is the "grounded" >tree model.... > >Karl W. Z. Heuer (ihnp4!bentley!kwh), The Walking Lint Uh, but what exactly is the "empty tree"? If we define <scalar> ::= <number> | <character> | enclose(<array>) <array> ::= n-dimensional array of (<scalar>)'s, n >= 0 then there IS no empty tree --- every enclosure has an array inside it. If you want a "default" scalar of type tree, I think you'd be better off reintroducing ONE object x0 satisfying x0 = >x0, and letting that be the default value. (Is this perhaps what you meant?) -- David Moews moews@h-sc4.harvard.EDU ...!seismo!harvard!h-sc4
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!allegra!princeton!caip!seismo!harvard!h-sc1!h-sc2!moews_2 From: moews_2@h-sc2.UUCP (moews_2) Newsgroups: net.lang.apl Subject: Re: Nested arrays Message-ID: <957@h-sc2.UUCP> Date: Fri, 23-May-86 00:05:33 EDT Article-I.D.: h-sc2.957 Posted: Fri May 23 00:05:33 1986 Date-Received: Sun, 25-May-86 17:48:20 EDT References: <371@water.UUCP> <834@bentley.UUCP> Reply-To: moews@h-sc4.harvard.EDU(david moews) Organization: Harvard University Science Center Lines: 24