141 lines
5.3 KiB
HTML
141 lines
5.3 KiB
HTML
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<head>
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<title>The GNU Fortran Compiler: UNPACK</title>
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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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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="UNPACK"></a>
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<div class="header">
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<p>
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Next: <a href="VERIFY.html#VERIFY" accesskey="n" rel="next">VERIFY</a>, Previous: <a href="UNLINK.html#UNLINK" accesskey="p" rel="prev">UNLINK</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="UNPACK-_002d_002d_002d-Unpack-an-array-of-rank-one-into-an-array"></a>
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<h3 class="section">9.270 <code>UNPACK</code> — Unpack an array of rank one into an array</h3>
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<a name="index-UNPACK"></a>
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<a name="index-array_002c-unpacking"></a>
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<a name="index-array_002c-increase-dimension-1"></a>
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<a name="index-array_002c-scatter-elements"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Store the elements of <var>VECTOR</var> in an array of higher rank.
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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 = UNPACK(VECTOR, MASK, FIELD)</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>VECTOR</var></td><td width="70%">Shall be an array of any type and rank one. It
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shall have at least as many elements as <var>MASK</var> has <code>TRUE</code> values.</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>.</td></tr>
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<tr><td width="15%"><var>FIELD</var></td><td width="70%">Shall be of the same type as <var>VECTOR</var> and have
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the same shape as <var>MASK</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 resulting array corresponds to <var>FIELD</var> with <code>TRUE</code> elements
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of <var>MASK</var> replaced by values from <var>VECTOR</var> in array element order.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">PROGRAM test_unpack
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integer :: vector(2) = (/1,1/)
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logical :: mask(4) = (/ .TRUE., .FALSE., .FALSE., .TRUE. /)
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integer :: field(2,2) = 0, unity(2,2)
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! result: unity matrix
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unity = unpack(vector, reshape(mask, (/2,2/)), field)
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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="PACK.html#PACK">PACK</a>, <a href="SPREAD.html#SPREAD">SPREAD</a>
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</p></dd>
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</dl>
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