Article View: net.lang.apl
Article #205Re: Nested arrays
From: KW Heuer
Date: Tue, 27 May 1986 18:24
Date: Tue, 27 May 1986 18:24
18 lines
1488 bytes
1488 bytes
In article <957@h-sc2.UUCP> h-sc2!moews_2 writes: >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.... > > 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. By "empty tree" I meant "zero-length vector of type tree." The "standard tree scalar" is ENCLOSE 0 RHO ENCLOSE anything. Sorry about the confusion. Karl W. Z. Heuer (ihnp4!bentley!kwh), The Walking Lint
Technical Details
Message-ID:
<861@bentley.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!allegra!princeton!caip!topaz!bentley!kwhReferences:
<957@h-sc2.UUCP>Show Full Headers
Complete Article Headers
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!topaz!bentley!kwh From: kwh@bentley.UUCP (KW Heuer) Newsgroups: net.lang.apl Subject: Re: Nested arrays Message-ID: <861@bentley.UUCP> Date: Tue, 27-May-86 14:24:48 EDT Article-I.D.: bentley.861 Posted: Tue May 27 14:24:48 1986 Date-Received: Thu, 29-May-86 02:40:59 EDT References: <957@h-sc2.UUCP> Organization: AT&T Bell Laboratories, Liberty Corner Lines: 18