179 lines
8.8 KiB
HTML
179 lines
8.8 KiB
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<!DOCTYPE html>
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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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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>SRFI-43 Constructors (Guile Reference Manual)</title>
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<meta name="description" content="SRFI-43 Constructors (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="SRFI_002d43.html" rel="up" title="SRFI-43">
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<link href="SRFI_002d43-Predicates.html" rel="next" title="SRFI-43 Predicates">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="SRFI_002d43-Constructors">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d43-Predicates.html" accesskey="n" rel="next">SRFI-43 Predicates</a>, Up: <a href="SRFI_002d43.html" accesskey="u" rel="up">SRFI-43 - Vector Library</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="SRFI_002d43-Constructors-1"><span>7.5.30.1 SRFI-43 Constructors<a class="copiable-link" href="#SRFI_002d43-Constructors-1"> ¶</a></span></h4>
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<dl class="first-deffn">
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<dt class="deffn" id="index-make_002dvector-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-vector</strong> <var class="def-var-arguments">size [fill]</var><a class="copiable-link" href="#index-make_002dvector-1"> ¶</a></span></dt>
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<dd><p>Create and return a vector of size <var class="var">size</var>, optionally filling it
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with <var class="var">fill</var>. The default value of <var class="var">fill</var> is unspecified.
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</p>
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<div class="example">
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<pre class="example-preformatted">(make-vector 5 3) ⇒ #(3 3 3 3 3)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector</strong> <var class="def-var-arguments">x …</var><a class="copiable-link" href="#index-vector-1"> ¶</a></span></dt>
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<dd><p>Create and return a vector whose elements are <var class="var">x</var> <small class="enddots">...</small>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector 0 1 2 3 4) ⇒ #(0 1 2 3 4)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dunfold"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-unfold</strong> <var class="def-var-arguments">f length initial-seed …</var><a class="copiable-link" href="#index-vector_002dunfold"> ¶</a></span></dt>
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<dd><p>The fundamental vector constructor. Create a vector whose length
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is <var class="var">length</var> and iterates across each index k from 0 up to
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<var class="var">length</var> - 1, applying <var class="var">f</var> at each iteration to the current
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index and current seeds, in that order, to receive n + 1 values: the
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element to put in the kth slot of the new vector, and n new seeds for
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the next iteration. It is an error for the number of seeds to vary
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between iterations.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-unfold (lambda (i x) (values x (- x 1)))
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10 0)
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⇒ #(0 -1 -2 -3 -4 -5 -6 -7 -8 -9)
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(vector-unfold values 10)
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⇒ #(0 1 2 3 4 5 6 7 8 9)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dunfold_002dright"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-unfold-right</strong> <var class="def-var-arguments">f length initial-seed …</var><a class="copiable-link" href="#index-vector_002dunfold_002dright"> ¶</a></span></dt>
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<dd><p>Like <code class="code">vector-unfold</code>, but it uses <var class="var">f</var> to generate elements from
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right-to-left, rather than left-to-right.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-unfold-right (lambda (i x) (values x (+ x 1)))
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10 0)
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⇒ #(9 8 7 6 5 4 3 2 1 0)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dcopy-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-copy</strong> <var class="def-var-arguments">vec [start [end [fill]]]</var><a class="copiable-link" href="#index-vector_002dcopy-1"> ¶</a></span></dt>
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<dd><p>Allocate a new vector whose length is <var class="var">end</var> - <var class="var">start</var> and fills
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it with elements from <var class="var">vec</var>, taking elements from <var class="var">vec</var> starting
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at index <var class="var">start</var> and stopping at index <var class="var">end</var>. <var class="var">start</var>
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defaults to 0 and <var class="var">end</var> defaults to the value of
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<code class="code">(vector-length vec)</code>. If <var class="var">end</var> extends beyond the length of
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<var class="var">vec</var>, the slots in the new vector that obviously cannot be filled
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by elements from <var class="var">vec</var> are filled with <var class="var">fill</var>, whose default
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value is unspecified.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-copy '#(a b c d e f g h i))
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⇒ #(a b c d e f g h i)
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(vector-copy '#(a b c d e f g h i) 6)
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⇒ #(g h i)
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(vector-copy '#(a b c d e f g h i) 3 6)
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⇒ #(d e f)
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(vector-copy '#(a b c d e f g h i) 6 12 'x)
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⇒ #(g h i x x x)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dreverse_002dcopy"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-reverse-copy</strong> <var class="def-var-arguments">vec [start [end]]</var><a class="copiable-link" href="#index-vector_002dreverse_002dcopy"> ¶</a></span></dt>
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<dd><p>Like <code class="code">vector-copy</code>, but it copies the elements in the reverse order
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from <var class="var">vec</var>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-reverse-copy '#(5 4 3 2 1 0) 1 5)
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⇒ #(1 2 3 4)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dappend"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-append</strong> <var class="def-var-arguments">vec …</var><a class="copiable-link" href="#index-vector_002dappend"> ¶</a></span></dt>
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<dd><p>Return a newly allocated vector that contains all elements in order from
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the subsequent locations in <var class="var">vec</var> <small class="enddots">...</small>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-append '#(a) '#(b c d))
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⇒ #(a b c d)
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</pre></div>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-vector_002dconcatenate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">vector-concatenate</strong> <var class="def-var-arguments">list-of-vectors</var><a class="copiable-link" href="#index-vector_002dconcatenate"> ¶</a></span></dt>
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<dd><p>Append each vector in <var class="var">list-of-vectors</var>. Equivalent to
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<code class="code">(apply vector-append list-of-vectors)</code>.
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</p>
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<div class="example">
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<pre class="example-preformatted">(vector-concatenate '(#(a b) #(c d)))
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⇒ #(a b c d)
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</pre></div>
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</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="SRFI_002d43-Predicates.html">SRFI-43 Predicates</a>, Up: <a href="SRFI_002d43.html">SRFI-43 - Vector Library</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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