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| <title>The GNU Fortran Compiler: IPARITY</title> |
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| <a name="IPARITY-_002d_002d_002d-Bitwise-XOR-of-array-elements"></a> |
| <h3 class="section">9.144 <code>IPARITY</code> — Bitwise XOR of array elements</h3> |
| <a name="index-IPARITY"></a> |
| <a name="index-array_002c-parity"></a> |
| <a name="index-array_002c-XOR"></a> |
| <a name="index-bits_002c-XOR-of-array-elements"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Reduces with bitwise XOR (exclusive or) the elements of <var>ARRAY</var> along |
| dimension <var>DIM</var> if the corresponding element in <var>MASK</var> is <code>TRUE</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2008 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Transformational function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><table> |
| <tr><td width="80%"><code>RESULT = IPARITY(ARRAY[, MASK])</code></td></tr> |
| <tr><td width="80%"><code>RESULT = IPARITY(ARRAY, DIM[, MASK])</code></td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>ARRAY</var></td><td width="70%">Shall be an array of type <code>INTEGER</code></td></tr> |
| <tr><td width="15%"><var>DIM</var></td><td width="70%">(Optional) shall be a scalar of type |
| <code>INTEGER</code> with a value in the range from 1 to n, where n |
| equals the rank of <var>ARRAY</var>.</td></tr> |
| <tr><td width="15%"><var>MASK</var></td><td width="70%">(Optional) shall be of type <code>LOGICAL</code> |
| and either be a scalar or an array of the same shape as <var>ARRAY</var>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The result is of the same type as <var>ARRAY</var>. |
| </p> |
| <p>If <var>DIM</var> is absent, a scalar with the bitwise XOR of all elements in |
| <var>ARRAY</var> is returned. Otherwise, an array of rank n-1, where n equals |
| the rank of <var>ARRAY</var>, and a shape similar to that of <var>ARRAY</var> with |
| dimension <var>DIM</var> dropped is returned. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_iparity |
| INTEGER(1) :: a(2) |
| |
| a(1) = b'00100100' |
| a(2) = b'01101010' |
| |
| ! prints 01001110 |
| PRINT '(b8.8)', IPARITY(a) |
| END PROGRAM |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="IANY.html#IANY">IANY</a>, <a href="IALL.html#IALL">IALL</a>, <a href="IEOR.html#IEOR">IEOR</a>, <a href="PARITY.html#PARITY">PARITY</a> |
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