163 lines
6.4 KiB
HTML
163 lines
6.4 KiB
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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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 the
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: PACK</title>
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<meta name="description" content="The GNU Fortran Compiler: PACK">
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<meta name="keywords" content="The GNU Fortran Compiler: PACK">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<link href="PARITY.html#PARITY" rel="next" title="PARITY">
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<link href="OR.html#OR" rel="prev" title="OR">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="PACK"></a>
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<div class="header">
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<p>
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Next: <a href="PARITY.html#PARITY" accesskey="n" rel="next">PARITY</a>, Previous: <a href="OR.html#OR" accesskey="p" rel="prev">OR</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="PACK-_002d_002d_002d-Pack-an-array-into-an-array-of-rank-one"></a>
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<h3 class="section">9.204 <code>PACK</code> — Pack an array into an array of rank one</h3>
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<a name="index-PACK"></a>
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<a name="index-array_002c-packing"></a>
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<a name="index-array_002c-reduce-dimension"></a>
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<a name="index-array_002c-gather-elements"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Stores the elements of <var>ARRAY</var> in an array of rank one.
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</p>
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<p>The beginning of the resulting array is made up of elements whose <var>MASK</var>
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equals <code>TRUE</code>. Afterwards, positions are filled with elements taken from
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<var>VECTOR</var>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 95 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Transformational function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = PACK(ARRAY, MASK[,VECTOR])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>ARRAY</var></td><td width="70%">Shall be an array of any type.</td></tr>
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<tr><td width="15%"><var>MASK</var></td><td width="70%">Shall be an array of type <code>LOGICAL</code> and
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of the same size as <var>ARRAY</var>. Alternatively, it may be a <code>LOGICAL</code>
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scalar.</td></tr>
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<tr><td width="15%"><var>VECTOR</var></td><td width="70%">(Optional) shall be an array of the same type
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as <var>ARRAY</var> and of rank one. If present, the number of elements in
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<var>VECTOR</var> shall be equal to or greater than the number of true elements
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in <var>MASK</var>. If <var>MASK</var> is scalar, the number of elements in
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<var>VECTOR</var> shall be equal to or greater than the number of elements in
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<var>ARRAY</var>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The result is an array of rank one and the same type as that of <var>ARRAY</var>.
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If <var>VECTOR</var> is present, the result size is that of <var>VECTOR</var>, the
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number of <code>TRUE</code> values in <var>MASK</var> otherwise.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><p>Gathering nonzero elements from an array:
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</p><div class="smallexample">
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<pre class="smallexample">PROGRAM test_pack_1
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INTEGER :: m(6)
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m = (/ 1, 0, 0, 0, 5, 0 /)
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WRITE(*, FMT="(6(I0, ' '))") pack(m, m /= 0) ! "1 5"
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END PROGRAM
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</pre></div>
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<p>Gathering nonzero elements from an array and appending elements from <var>VECTOR</var>:
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</p><div class="smallexample">
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<pre class="smallexample">PROGRAM test_pack_2
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INTEGER :: m(4)
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m = (/ 1, 0, 0, 2 /)
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WRITE(*, FMT="(4(I0, ' '))") pack(m, m /= 0, (/ 0, 0, 3, 4 /)) ! "1 2 3 4"
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END PROGRAM
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</pre></div>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="UNPACK.html#UNPACK">UNPACK</a>
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="PARITY.html#PARITY" accesskey="n" rel="next">PARITY</a>, Previous: <a href="OR.html#OR" accesskey="p" rel="prev">OR</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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