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| <title>The GNU Fortran Compiler: PACK</title> |
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| <a name="PACK-_002d_002d_002d-Pack-an-array-into-an-array-of-rank-one"></a> |
| <h3 class="section">8.189 <code>PACK</code> — Pack an array into an array of rank one</h3> |
| <a name="index-PACK"></a> |
| <a name="index-array_002c-packing"></a> |
| <a name="index-array_002c-reduce-dimension"></a> |
| <a name="index-array_002c-gather-elements"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p>Stores the elements of <var>ARRAY</var> in an array of rank one. |
| </p> |
| <p>The beginning of the resulting array is made up of elements whose <var>MASK</var> |
| equals <code>TRUE</code>. Afterwards, positions are filled with elements taken from |
| <var>VECTOR</var>. |
| </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><p><code>RESULT = PACK(ARRAY, MASK[,VECTOR])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>ARRAY</var></td><td width="70%">Shall be an array of any type.</td></tr> |
| <tr><td width="15%"><var>MASK</var></td><td width="70%">Shall be an array of type <code>LOGICAL</code> and |
| of the same size as <var>ARRAY</var>. Alternatively, it may be a <code>LOGICAL</code> |
| scalar.</td></tr> |
| <tr><td width="15%"><var>VECTOR</var></td><td width="70%">(Optional) shall be an array of the same type |
| as <var>ARRAY</var> and of rank one. If present, the number of elements in |
| <var>VECTOR</var> shall be equal to or greater than the number of true elements |
| in <var>MASK</var>. If <var>MASK</var> is scalar, the number of elements in |
| <var>VECTOR</var> shall be equal to or greater than the number of elements in |
| <var>ARRAY</var>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The result is an array of rank one and the same type as that of <var>ARRAY</var>. |
| If <var>VECTOR</var> is present, the result size is that of <var>VECTOR</var>, the |
| number of <code>TRUE</code> values in <var>MASK</var> otherwise. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><p>Gathering nonzero elements from an array: |
| </p><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_pack_1 |
| INTEGER :: m(6) |
| m = (/ 1, 0, 0, 0, 5, 0 /) |
| WRITE(*, FMT="(6(I0, ' '))") pack(m, m /= 0) ! "1 5" |
| END PROGRAM |
| </pre></div> |
| |
| <p>Gathering nonzero elements from an array and appending elements from <var>VECTOR</var>: |
| </p><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_pack_2 |
| INTEGER :: m(4) |
| m = (/ 1, 0, 0, 2 /) |
| WRITE(*, FMT="(4(I0, ' '))") pack(m, m /= 0, (/ 0, 0, 3, 4 /)) ! "1 2 3 4" |
| END PROGRAM |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="UNPACK.html#UNPACK">UNPACK</a> |
| </p></dd> |
| </dl> |
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