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<title>The GNU Fortran Compiler: COUNT</title>
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<a name="COUNT"></a>
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<div class="header">
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<p>
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Next: <a href="CPU_005fTIME.html#CPU_005fTIME" accesskey="n" rel="next">CPU_TIME</a>, Previous: <a href="COSH.html#COSH" accesskey="p" rel="prev">COSH</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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<hr>
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<a name="COUNT-_002d_002d_002d-Count-function"></a>
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<h3 class="section">9.71 <code>COUNT</code> — Count function</h3>
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<a name="index-COUNT"></a>
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<a name="index-array_002c-conditionally-count-elements"></a>
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<a name="index-array_002c-element-counting"></a>
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<a name="index-array_002c-number-of-elements"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd>
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<p>Counts the number of <code>.TRUE.</code> elements in a logical <var>MASK</var>,
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or, if the <var>DIM</var> argument is supplied, counts the number of
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elements along each row of the array in the <var>DIM</var> direction.
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If the array has zero size, or all of the elements of <var>MASK</var> are
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<code>.FALSE.</code>, then the result is <code>0</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, with <var>KIND</var> argument Fortran 2003 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 = COUNT(MASK [, DIM, KIND])</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>MASK</var></td><td width="70%">The type shall be <code>LOGICAL</code>.</td></tr>
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<tr><td width="15%"><var>DIM</var></td><td width="70%">(Optional) The type shall be <code>INTEGER</code>.</td></tr>
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<tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization
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expression indicating the kind parameter of the result.</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 return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If
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<var>KIND</var> is absent, the return value is of default integer kind.
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If <var>DIM</var> is present, the result is an array with a rank one less
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than the rank of <var>ARRAY</var>, and a size corresponding to the shape
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of <var>ARRAY</var> with the <var>DIM</var> dimension removed.
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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_count
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integer, dimension(2,3) :: a, b
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logical, dimension(2,3) :: mask
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a = reshape( (/ 1, 2, 3, 4, 5, 6 /), (/ 2, 3 /))
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b = reshape( (/ 0, 7, 3, 4, 5, 8 /), (/ 2, 3 /))
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print '(3i3)', a(1,:)
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print '(3i3)', a(2,:)
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print *
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print '(3i3)', b(1,:)
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print '(3i3)', b(2,:)
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print *
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mask = a.ne.b
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print '(3l3)', mask(1,:)
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print '(3l3)', mask(2,:)
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print *
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print '(3i3)', count(mask)
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print *
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print '(3i3)', count(mask, 1)
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print *
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print '(3i3)', count(mask, 2)
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end program test_count
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</pre></div>
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</dd>
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</dl>
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Next: <a href="CPU_005fTIME.html#CPU_005fTIME" accesskey="n" rel="next">CPU_TIME</a>, Previous: <a href="COSH.html#COSH" accesskey="p" rel="prev">COSH</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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