113 lines
5.1 KiB
HTML
113 lines
5.1 KiB
HTML
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<!DOCTYPE html>
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Arrays (Guile Reference Manual)</title>
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<meta name="description" content="Arrays (Guile Reference Manual)">
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<meta name="keywords" content="Arrays (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Data-Types.html" rel="up" title="Data Types">
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<link href="VLists.html" rel="next" title="VLists">
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<link href="Bytevectors.html" rel="prev" title="Bytevectors">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Arrays">
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<div class="nav-panel">
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<p>
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Next: <a href="VLists.html" accesskey="n" rel="next">VLists</a>, Previous: <a href="Bytevectors.html" accesskey="p" rel="prev">Bytevectors</a>, Up: <a href="Data-Types.html" accesskey="u" rel="up">Data Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsection" id="Arrays-1"><span>6.6.13 Arrays<a class="copiable-link" href="#Arrays-1"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-Arrays"></a>
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<p><em class="dfn">Arrays</em> are a collection of cells organized into an arbitrary
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number of dimensions. Each cell can be accessed in constant time by
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supplying an index for each dimension.
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</p>
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<p>In the current implementation, an array uses a vector of some kind for
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the actual storage of its elements. Any kind of vector will do, so you
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can have arrays of uniform numeric values, arrays of characters, arrays
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of bits, and of course, arrays of arbitrary Scheme values. For example,
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arrays with an underlying <code class="code">c64vector</code> might be nice for digital
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signal processing, while arrays made from a <code class="code">u8vector</code> might be
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used to hold gray-scale images.
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</p>
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<p>The number of dimensions of an array is called its <em class="dfn">rank</em>. Thus,
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a matrix is an array of rank 2, while a vector has rank 1. When
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accessing an array element, you have to specify one exact integer for
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each dimension. These integers are called the <em class="dfn">indices</em> of the
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element. An array specifies the allowed range of indices for each
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dimension via an inclusive lower and upper bound. These bounds can
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well be negative, but the upper bound must be greater than or equal to
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the lower bound minus one. When all lower bounds of an array are
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zero, it is called a <em class="dfn">zero-origin</em> array.
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</p>
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<p>Arrays can be of rank 0, which could be interpreted as a scalar.
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Thus, a zero-rank array can store exactly one object and the list of
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indices of this element is the empty list.
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</p>
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<p>Arrays contain zero elements when one of their dimensions has a zero
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length. These empty arrays maintain information about their shape: a
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matrix with zero columns and 3 rows is different from a matrix with 3
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columns and zero rows, which again is different from a vector of
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length zero.
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</p>
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<p>The array procedures are all polymorphic, treating strings, uniform
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numeric vectors, bytevectors, bit vectors and ordinary vectors as one
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dimensional arrays.
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</p>
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<ul class="mini-toc">
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<li><a href="Array-Syntax.html" accesskey="1">Array Syntax</a></li>
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<li><a href="Array-Procedures.html" accesskey="2">Array Procedures</a></li>
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<li><a href="Shared-Arrays.html" accesskey="3">Shared Arrays</a></li>
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<li><a href="Arrays-as-arrays-of-arrays.html" accesskey="4">Arrays as arrays of arrays</a></li>
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<li><a href="Accessing-Arrays-from-C.html" accesskey="5">Accessing Arrays from C</a></li>
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</ul>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="VLists.html">VLists</a>, Previous: <a href="Bytevectors.html">Bytevectors</a>, Up: <a href="Data-Types.html">Data Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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