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| <h3 class="section">8.190 <code>PARITY</code> — Reduction with exclusive OR</h3> |
| |
| <p><a name="index-PARITY-936"></a><a name="index-Parity-937"></a><a name="index-Reduction_002c-XOR-938"></a><a name="index-XOR-reduction-939"></a> |
| <dl> |
| <dt><em>Description</em>:<dd>Calculates the parity, i.e. the reduction using <code>.XOR.</code>, |
| of <var>MASK</var> along dimension <var>DIM</var>. |
| |
| <br><dt><em>Standard</em>:<dd>Fortran 2008 and later |
| |
| <br><dt><em>Class</em>:<dd>Transformational function |
| |
| <br><dt><em>Syntax</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="80%"><code>RESULT = PARITY(MASK[, DIM])</code> |
| <br></td></tr></table> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>LOGICAL</var> </td><td valign="top" width="70%">Shall be an array of type <code>LOGICAL</code> |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>DIM</var> </td><td valign="top" 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>MASK</var>. |
| <br></td></tr></table> |
| |
| <br><dt><em>Return value</em>:<dd>The result is of the same type as <var>MASK</var>. |
| |
| <p>If <var>DIM</var> is absent, a scalar with the parity of all elements in |
| <var>MASK</var> is returned, i.e. true if an odd number of elements is |
| <code>.true.</code> and false otherwise. If <var>DIM</var> is present, an array |
| of rank n-1, where n equals the rank of <var>ARRAY</var>, |
| and a shape similar to that of <var>MASK</var> with dimension <var>DIM</var> |
| dropped is returned. |
| |
| <br><dt><em>Example</em>:<dd> |
| <pre class="smallexample"> PROGRAM test_sum |
| LOGICAL :: x(2) = [ .true., .false. ] |
| print *, PARITY(x) ! prints "T" (true). |
| END PROGRAM |
| </pre> |
| </dl> |
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