<HTML> <HEAD> <!-- Created by texi2html 1.56k + clip patches and <A href="http://www.clip.dia.fi.upm.es/Software">lpdoc</A> from ciao.texi on 28 January 2007 --> <LINK rel="stylesheet" href="ciao.css" type="text/css"> <TITLE>The Ciao Prolog System - Extendable arrays with logarithmic access time</TITLE> </HEAD> <BODY> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_163.html">previous</A>, <A HREF="ciao_165.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. <P><HR><P> <H1><A NAME="SEC683" HREF="ciao_toc.html#TOC683">Extendable arrays with logarithmic access time</A></H1> <P> <A NAME="IDX7741"></A> <P> <STRONG>Author(s):</STRONG> Lena Flood. <P> <STRONG>Version:</STRONG> 1.10#7 (2006/4/26, 19:22:13 CEST) <P> <STRONG>Version of last change:</STRONG> 1.9#236 (2003/12/22, 18:18:14 CET) <P> This module implements extendable arrays with logarithmic access time. It has been adapted from shared code written by David Warren and Fernando Pereira. <UL> <LI><A HREF="ciao_164.html#SEC684">Usage and interface (arrays)</A> <LI><A HREF="ciao_164.html#SEC685">Documentation on exports (arrays)</A> </UL> <H2><A NAME="SEC684" HREF="ciao_toc.html#TOC684">Usage and interface (<CODE>arrays</CODE>)</A></H2> <div class="cartouche"> <UL> <LI><STRONG>Library usage:</STRONG> <CODE>:- use_module(library(arrays)).</CODE> <LI><STRONG>Exports:</STRONG> <UL> <LI><EM>Predicates:</EM> <A NAME="IDX7742"></A> <CODE>new_array/1</CODE>, <A NAME="IDX7743"></A> <CODE>is_array/1</CODE>, <A NAME="IDX7744"></A> <CODE>aref/3</CODE>, <A NAME="IDX7745"></A> <CODE>arefa/3</CODE>, <A NAME="IDX7746"></A> <CODE>arefl/3</CODE>, <A NAME="IDX7747"></A> <CODE>aset/4</CODE>, <A NAME="IDX7748"></A> <CODE>array_to_list/2</CODE>. </UL> </UL> </div class="cartouche"> <H2><A NAME="SEC685" HREF="ciao_toc.html#TOC685">Documentation on exports (<CODE>arrays</CODE>)</A></H2> <P> <A NAME="IDX7749"></A> <A NAME="IDX7750"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>new_array/1:</B> <DD><A NAME="IDX7751"></A> <P> <STRONG>Usage:</STRONG> <CODE>new_array(-Array)</CODE> <UL> <LI><EM>Description:</EM> returns an empty new array <CODE>Array</CODE>. </UL> </DL> <P> <A NAME="IDX7752"></A> <A NAME="IDX7753"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>is_array/1:</B> <DD><A NAME="IDX7754"></A> <P> <STRONG>Usage:</STRONG> <CODE>is_array(+Array)</CODE> <UL> <LI><EM>Description:</EM> <CODE>Array</CODE> actually is an array. </UL> </DL> <P> <A NAME="IDX7755"></A> <A NAME="IDX7756"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>aref/3:</B> <DD><A NAME="IDX7757"></A> <P> <STRONG>Usage:</STRONG> <CODE>aref(+Index, +Array, ?Element)</CODE> <UL> <LI><EM>Description:</EM> unifies <CODE>Element</CODE> to <CODE>Array</CODE>[<CODE>Index</CODE>], or fails if <CODE>Array</CODE>[<CODE>Index</CODE>] has not been set. </UL> </DL> <P> <A NAME="IDX7758"></A> <A NAME="IDX7759"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>arefa/3:</B> <DD><A NAME="IDX7760"></A> <P> <STRONG>Usage:</STRONG> <CODE>arefa(+Index, +Array, ?Element)</CODE> <UL> <LI><EM>Description:</EM> is as <CODE>aref/3</CODE>, except that it unifies <CODE>Element</CODE> with a new array if <CODE>Array</CODE>[<CODE>Index</CODE>] is undefined. This is useful for multidimensional arrays implemented as arrays of arrays. </UL> </DL> <P> <A NAME="IDX7761"></A> <A NAME="IDX7762"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>arefl/3:</B> <DD><A NAME="IDX7763"></A> <P> <STRONG>Usage:</STRONG> <CODE>arefl(+Index, +Array, ?Element)</CODE> <UL> <LI><EM>Description:</EM> is as <CODE>aref/3</CODE>, except that <CODE>Element</CODE> appears as <CODE>[]</CODE> for undefined cells. Thus, <CODE>arefl(_,_,[])</CODE> always succeeds no matter what you give in the first or second args. </UL> </DL> <P> <A NAME="IDX7764"></A> <A NAME="IDX7765"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>aset/4:</B> <DD><A NAME="IDX7766"></A> <P> <STRONG>Usage:</STRONG> <CODE>aset(+Index, +Array, Element, -NewArray)</CODE> <UL> <LI><EM>Description:</EM> unifies <CODE>NewArray</CODE> with the result of setting <CODE>Array</CODE>[<CODE>Index</CODE>] to <CODE>Element</CODE>. </UL> </DL> <P> <A NAME="IDX7767"></A> <A NAME="IDX7768"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>array_to_list/2:</B> <DD><A NAME="IDX7769"></A> <P> <STRONG>Usage:</STRONG> <CODE>array_to_list(+Array, -List)</CODE> <UL> <LI><EM>Description:</EM> returns a <CODE>List</CODE> of pairs Index-Element of all the elements of <CODE>Array</CODE> that have been set. </UL> </DL> <P><HR><P> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_163.html">previous</A>, <A HREF="ciao_165.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. </BODY> </HTML>
