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114 lines
10 KiB
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<!DOCTYPE html>
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<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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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>Bytevectors as Floats (Guile Reference Manual)</title>
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<meta name="description" content="Bytevectors as Floats (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="Bytevectors.html" rel="up" title="Bytevectors">
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<link href="Bytevectors-as-Strings.html" rel="next" title="Bytevectors as Strings">
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<link href="Bytevectors-and-Integer-Lists.html" rel="prev" title="Bytevectors and Integer Lists">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="Bytevectors-as-Floats">
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<div class="nav-panel">
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<p>
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Next: <a href="Bytevectors-as-Strings.html" accesskey="n" rel="next">Interpreting Bytevector Contents as Unicode Strings</a>, Previous: <a href="Bytevectors-and-Integer-Lists.html" accesskey="p" rel="prev">Converting Bytevectors to/from Integer Lists</a>, Up: <a href="Bytevectors.html" accesskey="u" rel="up">Bytevectors</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="Interpreting-Bytevector-Contents-as-Floating-Point-Numbers"><span>6.6.12.5 Interpreting Bytevector Contents as Floating Point Numbers<a class="copiable-link" href="#Interpreting-Bytevector-Contents-as-Floating-Point-Numbers"> ¶</a></span></h4>
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<a class="index-entry-id" id="index-IEEE_002d754-floating-point-numbers"></a>
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<p>Bytevector contents can also be accessed as IEEE-754 single- or
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double-precision floating point numbers (respectively 32 and 64-bit
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long) using the procedures described here.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-bytevector_002dieee_002dsingle_002dref"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-single-ref</strong> <var class="def-var-arguments">bv index endianness</var><a class="copiable-link" href="#index-bytevector_002dieee_002dsingle_002dref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-bytevector_002dieee_002ddouble_002dref"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-double-ref</strong> <var class="def-var-arguments">bv index endianness</var><a class="copiable-link" href="#index-bytevector_002dieee_002ddouble_002dref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fsingle_005fref"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_single_ref</strong> <var class="def-var-arguments">(bv, index, endianness)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fsingle_005fref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fdouble_005fref"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_double_ref</strong> <var class="def-var-arguments">(bv, index, endianness)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fdouble_005fref"> ¶</a></span></dt>
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<dd><p>Return the IEEE-754 single-precision floating point number from <var class="var">bv</var>
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at <var class="var">index</var> according to <var class="var">endianness</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-bytevector_002dieee_002dsingle_002dset_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-single-set!</strong> <var class="def-var-arguments">bv index value endianness</var><a class="copiable-link" href="#index-bytevector_002dieee_002dsingle_002dset_0021"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-bytevector_002dieee_002ddouble_002dset_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-double-set!</strong> <var class="def-var-arguments">bv index value endianness</var><a class="copiable-link" href="#index-bytevector_002dieee_002ddouble_002dset_0021"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fsingle_005fset_005fx"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_single_set_x</strong> <var class="def-var-arguments">(bv, index, value, endianness)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fsingle_005fset_005fx"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fdouble_005fset_005fx"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_double_set_x</strong> <var class="def-var-arguments">(bv, index, value, endianness)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fdouble_005fset_005fx"> ¶</a></span></dt>
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<dd><p>Store real number <var class="var">value</var> in <var class="var">bv</var> at <var class="var">index</var> according to
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<var class="var">endianness</var>.
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</p></dd></dl>
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<p>Specialized procedures are also available:
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-bytevector_002dieee_002dsingle_002dnative_002dref"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-single-native-ref</strong> <var class="def-var-arguments">bv index</var><a class="copiable-link" href="#index-bytevector_002dieee_002dsingle_002dnative_002dref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-bytevector_002dieee_002ddouble_002dnative_002dref"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-double-native-ref</strong> <var class="def-var-arguments">bv index</var><a class="copiable-link" href="#index-bytevector_002dieee_002ddouble_002dnative_002dref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fsingle_005fnative_005fref"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_single_native_ref</strong> <var class="def-var-arguments">(bv, index)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fsingle_005fnative_005fref"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fdouble_005fnative_005fref"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_double_native_ref</strong> <var class="def-var-arguments">(bv, index)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fdouble_005fnative_005fref"> ¶</a></span></dt>
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<dd><p>Return the IEEE-754 single-precision floating point number from <var class="var">bv</var>
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at <var class="var">index</var> according to the host’s native endianness.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-bytevector_002dieee_002dsingle_002dnative_002dset_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-single-native-set!</strong> <var class="def-var-arguments">bv index value</var><a class="copiable-link" href="#index-bytevector_002dieee_002dsingle_002dnative_002dset_0021"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-bytevector_002dieee_002ddouble_002dnative_002dset_0021"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">bytevector-ieee-double-native-set!</strong> <var class="def-var-arguments">bv index value</var><a class="copiable-link" href="#index-bytevector_002dieee_002ddouble_002dnative_002dset_0021"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fsingle_005fnative_005fset_005fx"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_single_native_set_x</strong> <var class="def-var-arguments">(bv, index, value)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fsingle_005fnative_005fset_005fx"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-scm_005fbytevector_005fieee_005fdouble_005fnative_005fset_005fx"><span class="category-def">C Function: </span><span><strong class="def-name">scm_bytevector_ieee_double_native_set_x</strong> <var class="def-var-arguments">(bv, index, value)</var><a class="copiable-link" href="#index-scm_005fbytevector_005fieee_005fdouble_005fnative_005fset_005fx"> ¶</a></span></dt>
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<dd><p>Store real number <var class="var">value</var> in <var class="var">bv</var> at <var class="var">index</var> according to
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the host’s native endianness.
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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="Bytevectors-as-Strings.html">Interpreting Bytevector Contents as Unicode Strings</a>, Previous: <a href="Bytevectors-and-Integer-Lists.html">Converting Bytevectors to/from Integer Lists</a>, Up: <a href="Bytevectors.html">Bytevectors</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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