140 lines
8.6 KiB
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140 lines
8.6 KiB
HTML
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Vector Creation (Guile Reference Manual)</title>
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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="Vectors.html" rel="up" title="Vectors">
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<div class="subsubsection-level-extent" id="Vector-Creation">
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<p>
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Next: <a href="Vector-Accessors.html" accesskey="n" rel="next">Accessing and Modifying Vector Contents</a>, Previous: <a href="Vector-Syntax.html" accesskey="p" rel="prev">Read Syntax for Vectors</a>, Up: <a href="Vectors.html" accesskey="u" rel="up">Vectors</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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<hr>
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<h4 class="subsubsection" id="Dynamic-Vector-Creation-and-Validation"><span>6.6.10.2 Dynamic Vector Creation and Validation<a class="copiable-link" href="#Dynamic-Vector-Creation-and-Validation"> ¶</a></span></h4>
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<p>Instead of creating a vector implicitly by using the read syntax just
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described, you can create a vector dynamically by calling one of the
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<code class="code">vector</code> and <code class="code">list->vector</code> primitives with the list of Scheme
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values that you want to place into a vector. The size of the vector
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thus created is determined implicitly by the number of arguments given.
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</p>
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<a class="index-entry-id" id="index-vector-3"></a>
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<a class="index-entry-id" id="index-list_002d_003evector-3"></a>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector</strong> <var class="def-var-arguments">arg …</var><a class="copiable-link" href="#index-vector"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-list_002d_003evector"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">list->vector</strong> <var class="def-var-arguments">l</var><a class="copiable-link" href="#index-list_002d_003evector"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fvector"><span class="category-def">C Function: </span><span><strong class="def-name">scm_vector</strong> <var class="def-var-arguments">(l)</var><a class="copiable-link" href="#index-scm_005fvector"> ¶</a></span></dt>
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<dd><p>Return a newly allocated vector composed of the
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given arguments. Analogous to <code class="code">list</code>.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(vector 'a 'b 'c) ⇒ #(a b c)
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</pre></div>
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</dd></dl>
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<p>The inverse operation is <code class="code">vector->list</code>:
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</p>
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<a class="index-entry-id" id="index-vector_002d_003elist-3"></a>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002d_003elist"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector->list</strong> <var class="def-var-arguments">v</var><a class="copiable-link" href="#index-vector_002d_003elist"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fvector_005fto_005flist"><span class="category-def">C Function: </span><span><strong class="def-name">scm_vector_to_list</strong> <var class="def-var-arguments">(v)</var><a class="copiable-link" href="#index-scm_005fvector_005fto_005flist"> ¶</a></span></dt>
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<dd><p>Return a newly allocated list composed of the elements of <var class="var">v</var>.
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(vector->list #(dah dah didah)) ⇒ (dah dah didah)
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(list->vector '(dididit dah)) ⇒ #(dididit dah)
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</pre></div>
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</dd></dl>
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<p>To allocate a vector with an explicitly specified size, use
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<code class="code">make-vector</code>. With this primitive you can also specify an initial
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value for the vector elements (the same value for all elements, that
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is):
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</p>
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<a class="index-entry-id" id="index-make_002dvector-4"></a>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dvector"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-vector</strong> <var class="def-var-arguments">len [fill]</var><a class="copiable-link" href="#index-make_002dvector"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fmake_005fvector"><span class="category-def">C Function: </span><span><strong class="def-name">scm_make_vector</strong> <var class="def-var-arguments">(len, fill)</var><a class="copiable-link" href="#index-scm_005fmake_005fvector"> ¶</a></span></dt>
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<dd><p>Return a newly allocated vector of <var class="var">len</var> elements. If a
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second argument is given, then each position is initialized to
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<var class="var">fill</var>. Otherwise the initial contents of each position is
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unspecified.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fc_005fmake_005fvector"><span class="category-def">C Function: </span><span><code class="def-type">SCM</code> <strong class="def-name">scm_c_make_vector</strong> <code class="def-code-arguments">(size_t k, SCM fill)</code><a class="copiable-link" href="#index-scm_005fc_005fmake_005fvector"> ¶</a></span></dt>
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<dd><p>Like <code class="code">scm_make_vector</code>, but the length is given as a <code class="code">size_t</code>.
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</p></dd></dl>
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<p>To check whether an arbitrary Scheme value <em class="emph">is</em> a vector, use the
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<code class="code">vector?</code> primitive:
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</p>
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<a class="index-entry-id" id="index-vector_003f-4"></a>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-vector_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fvector_005fp"><span class="category-def">C Function: </span><span><strong class="def-name">scm_vector_p</strong> <var class="def-var-arguments">(obj)</var><a class="copiable-link" href="#index-scm_005fvector_005fp"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">obj</var> is a vector, otherwise return
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<code class="code">#f</code>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fis_005fvector"><span class="category-def">C Function: </span><span><code class="def-type">int</code> <strong class="def-name">scm_is_vector</strong> <code class="def-code-arguments">(SCM obj)</code><a class="copiable-link" href="#index-scm_005fis_005fvector"> ¶</a></span></dt>
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<dd><p>Return non-zero when <var class="var">obj</var> is a vector, otherwise return
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<code class="code">zero</code>.
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</p></dd></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="Vector-Accessors.html">Accessing and Modifying Vector Contents</a>, Previous: <a href="Vector-Syntax.html">Read Syntax for Vectors</a>, Up: <a href="Vectors.html">Vectors</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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