149 lines
5.6 KiB
HTML
149 lines
5.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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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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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development. -->
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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: SUM</title>
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<meta name="description" content="The GNU Fortran Compiler: SUM">
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<meta name="keywords" content="The GNU Fortran Compiler: SUM">
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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="SYMLNK.html#SYMLNK" rel="next" title="SYMLNK">
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<link href="STORAGE_005fSIZE.html#STORAGE_005fSIZE" rel="prev" title="STORAGE_SIZE">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="SUM"></a>
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<div class="header">
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<p>
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Next: <a href="SYMLNK.html#SYMLNK" accesskey="n" rel="next">SYMLNK</a>, Previous: <a href="STORAGE_005fSIZE.html#STORAGE_005fSIZE" accesskey="p" rel="prev">STORAGE_SIZE</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="SUM-_002d_002d_002d-Sum-of-array-elements"></a>
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<h3 class="section">9.251 <code>SUM</code> — Sum of array elements</h3>
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<a name="index-SUM"></a>
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<a name="index-array_002c-sum"></a>
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<a name="index-array_002c-add-elements"></a>
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<a name="index-array_002c-conditionally-add-elements"></a>
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<a name="index-sum-array-elements"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Adds the elements of <var>ARRAY</var> along dimension <var>DIM</var> if
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the corresponding element in <var>MASK</var> is <code>TRUE</code>.
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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><table>
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<tr><td width="80%"><code>RESULT = SUM(ARRAY[, MASK])</code></td></tr>
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<tr><td width="80%"><code>RESULT = SUM(ARRAY, DIM[, MASK])</code></td></tr>
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</table>
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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 type <code>INTEGER</code>,
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<code>REAL</code> or <code>COMPLEX</code>.</td></tr>
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<tr><td width="15%"><var>DIM</var></td><td width="70%">(Optional) shall be a scalar of type
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<code>INTEGER</code> with a value in the range from 1 to n, where n
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equals the rank of <var>ARRAY</var>.</td></tr>
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<tr><td width="15%"><var>MASK</var></td><td width="70%">(Optional) shall be of type <code>LOGICAL</code>
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and either be a scalar or an array of the same shape as <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 of the same type as <var>ARRAY</var>.
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</p>
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<p>If <var>DIM</var> is absent, a scalar with the sum of all elements in <var>ARRAY</var>
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is returned. Otherwise, an array of rank n-1, where n equals the rank of
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<var>ARRAY</var>, and a shape similar to that of <var>ARRAY</var> with dimension <var>DIM</var>
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dropped is returned.
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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_sum
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INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /)
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print *, SUM(x) ! all elements, sum = 15
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print *, SUM(x, MASK=MOD(x, 2)==1) ! odd elements, sum = 9
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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="PRODUCT.html#PRODUCT">PRODUCT</a>
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</p></dd>
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</dl>
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</body>
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</html>
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