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| <title>The GNU Fortran Compiler: COUNT</title> |
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| <a name="COUNT-_002d_002d_002d-Count-function"></a> |
| <h3 class="section">8.57 <code>COUNT</code> — Count function</h3> |
| <a name="index-COUNT"></a> |
| <a name="index-array_002c-conditionally-count-elements"></a> |
| <a name="index-array_002c-element-counting"></a> |
| <a name="index-array_002c-number-of-elements"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd> |
| <p>Counts the number of <code>.TRUE.</code> elements in a logical <var>MASK</var>, |
| or, if the <var>DIM</var> argument is supplied, counts the number of |
| elements along each row of the array in the <var>DIM</var> direction. |
| If the array has zero size, or all of the elements of <var>MASK</var> are |
| <code>.FALSE.</code>, then the result is <code>0</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Transformational function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = COUNT(MASK [, DIM, KIND])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>MASK</var></td><td width="70%">The type shall be <code>LOGICAL</code>.</td></tr> |
| <tr><td width="15%"><var>DIM</var></td><td width="70%">(Optional) The type shall be <code>INTEGER</code>.</td></tr> |
| <tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization |
| expression indicating the kind parameter of the result.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If |
| <var>KIND</var> is absent, the return value is of default integer kind. |
| If <var>DIM</var> is present, the result is an array with a rank one less |
| than the rank of <var>ARRAY</var>, and a size corresponding to the shape |
| of <var>ARRAY</var> with the <var>DIM</var> dimension removed. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_count |
| integer, dimension(2,3) :: a, b |
| logical, dimension(2,3) :: mask |
| a = reshape( (/ 1, 2, 3, 4, 5, 6 /), (/ 2, 3 /)) |
| b = reshape( (/ 0, 7, 3, 4, 5, 8 /), (/ 2, 3 /)) |
| print '(3i3)', a(1,:) |
| print '(3i3)', a(2,:) |
| print * |
| print '(3i3)', b(1,:) |
| print '(3i3)', b(2,:) |
| print * |
| mask = a.ne.b |
| print '(3l3)', mask(1,:) |
| print '(3l3)', mask(2,:) |
| print * |
| print '(3i3)', count(mask) |
| print * |
| print '(3i3)', count(mask, 1) |
| print * |
| print '(3i3)', count(mask, 2) |
| end program test_count |
| </pre></div> |
| </dd> |
| </dl> |
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