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| <title>The GNU Fortran Compiler: PRODUCT</title> |
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| <a name="PRODUCT-_002d_002d_002d-Product-of-array-elements"></a> |
| <h3 class="section">8.196 <code>PRODUCT</code> — Product of array elements</h3> |
| <a name="index-PRODUCT"></a> |
| <a name="index-array_002c-product"></a> |
| <a name="index-array_002c-multiply-elements"></a> |
| <a name="index-array_002c-conditionally-multiply-elements"></a> |
| <a name="index-multiply-array-elements"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Multiplies 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 95 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 = PRODUCT(ARRAY[, MASK])</code></td></tr> |
| <tr><td width="80%"><code>RESULT = PRODUCT(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>, |
| <code>REAL</code> or <code>COMPLEX</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 product 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_product |
| INTEGER :: x(5) = (/ 1, 2, 3, 4 ,5 /) |
| print *, PRODUCT(x) ! all elements, product = 120 |
| print *, PRODUCT(x, MASK=MOD(x, 2)==1) ! odd elements, product = 15 |
| END PROGRAM |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="SUM.html#SUM">SUM</a> |
| </p></dd> |
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