157 lines
6.3 KiB
HTML
157 lines
6.3 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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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>Array Syntax (Guile Reference Manual)</title>
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<meta name="description" content="Array Syntax (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="Arrays.html" rel="up" title="Arrays">
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<link href="Array-Procedures.html" rel="next" title="Array Procedures">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Array-Syntax">
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<div class="nav-panel">
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<p>
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Next: <a href="Array-Procedures.html" accesskey="n" rel="next">Array Procedures</a>, Up: <a href="Arrays.html" accesskey="u" rel="up">Arrays</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="subsubsection" id="Array-Syntax-1"><span>6.6.13.1 Array Syntax<a class="copiable-link" href="#Array-Syntax-1"> ¶</a></span></h4>
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<p>An array is displayed as <code class="code">#</code> followed by its rank, followed by a
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tag that describes the underlying vector, optionally followed by
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information about its shape, and finally followed by the cells,
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organized into dimensions using parentheses.
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</p>
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<p>In more words, the array tag is of the form
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</p>
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<div class="example">
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<pre class="example-preformatted"> #<rank><vectag><@lower><:len><@lower><:len>...
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</pre></div>
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<p>where <code class="code"><rank></code> is a positive integer in decimal giving the rank of
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the array. It is omitted when the rank is 1 and the array is non-shared
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and has zero-origin (see below). For shared arrays and for a non-zero
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origin, the rank is always printed even when it is 1 to distinguish
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them from ordinary vectors.
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</p>
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<p>The <code class="code"><vectag></code> part is the tag for a uniform numeric vector, like
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<code class="code">u8</code>, <code class="code">s16</code>, etc, <code class="code">b</code> for bitvectors, or <code class="code">a</code> for
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strings. It is empty for ordinary vectors.
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</p>
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<p>The <code class="code"><@lower></code> part is a ‘<samp class="samp">@</samp>’ character followed by a signed
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integer in decimal giving the lower bound of a dimension. There is one
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<code class="code"><@lower></code> for each dimension. When all lower bounds are zero,
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all <code class="code"><@lower></code> parts are omitted.
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</p>
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<p>The <code class="code"><:len></code> part is a ‘<samp class="samp">:</samp>’ character followed by an unsigned
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integer in decimal giving the length of a dimension. Like for the lower
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bounds, there is one <code class="code"><:len></code> for each dimension, and the
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<code class="code"><:len></code> part always follows the <code class="code"><@lower></code> part for a
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dimension. Lengths are only then printed when they can’t be deduced
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from the nested lists of elements of the array literal, which can happen
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when at least one length is zero.
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</p>
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<p>As a special case, an array of rank 0 is printed as
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<code class="code">#0<vectag>(<scalar>)</code>, where <code class="code"><scalar></code> is the result of
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printing the single element of the array.
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</p>
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<p>Thus,
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</p>
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<dl class="table">
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<dt><code class="code">#(1 2 3)</code></dt>
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<dd><p>is an ordinary array of rank 1 with lower bound 0 in dimension 0.
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(I.e., a regular vector.)
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</p>
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</dd>
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<dt><code class="code">#@2(1 2 3)</code></dt>
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<dd><p>is an ordinary array of rank 1 with lower bound 2 in dimension 0.
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</p>
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</dd>
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<dt><code class="code">#2((1 2 3) (4 5 6))</code></dt>
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<dd><p>is a non-uniform array of rank 2; a 2x3 matrix with index ranges 0..1
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and 0..2.
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</p>
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</dd>
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<dt><code class="code">#u8(0 1 2)</code></dt>
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<dd><p>is a uniform u8 array of rank 1.
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</p>
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</dd>
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<dt><code class="code">#2u32@2@3((1 2) (2 3))</code></dt>
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<dd><p>is a uniform u32 array of rank 2 with index ranges 2..3 and 3..4.
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</p>
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</dd>
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<dt><code class="code">#2()</code></dt>
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<dd><p>is a two-dimensional array with index ranges 0..-1 and 0..-1, i.e.
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both dimensions have length zero.
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</p>
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</dd>
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<dt><code class="code">#2:0:2()</code></dt>
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<dd><p>is a two-dimensional array with index ranges 0..-1 and 0..1, i.e. the
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first dimension has length zero, but the second has length 2.
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</p>
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</dd>
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<dt><code class="code">#0(12)</code></dt>
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<dd><p>is a rank-zero array with contents 12.
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</p>
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</dd>
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</dl>
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<p>In addition, bytevectors are also arrays, but use a different syntax
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(see <a class="pxref" href="Bytevectors.html">Bytevectors</a>):
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</p>
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<dl class="table">
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<dt><code class="code">#vu8(1 2 3)</code></dt>
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<dd><p>is a 3-byte long bytevector, with contents 1, 2, 3.
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</p>
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</dd>
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</dl>
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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="Array-Procedures.html">Array Procedures</a>, Up: <a href="Arrays.html">Arrays</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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