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| <title>The GNU Fortran Compiler: CSHIFT</title> |
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| <a name="CSHIFT"></a> |
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| <a name="CSHIFT-_002d_002d_002d-Circular-shift-elements-of-an-array"></a> |
| <h3 class="section">8.59 <code>CSHIFT</code> — Circular shift elements of an array</h3> |
| <a name="index-CSHIFT"></a> |
| <a name="index-array_002c-shift-circularly"></a> |
| <a name="index-array_002c-permutation"></a> |
| <a name="index-array_002c-rotate"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>CSHIFT(ARRAY, SHIFT [, DIM])</code> performs a circular shift on elements of |
| <var>ARRAY</var> along the dimension of <var>DIM</var>. If <var>DIM</var> is omitted it is |
| taken to be <code>1</code>. <var>DIM</var> is a scalar of type <code>INTEGER</code> in the |
| range of <em>1 \leq DIM \leq n)</em> where <em>n</em> is the rank of <var>ARRAY</var>. |
| If the rank of <var>ARRAY</var> is one, then all elements of <var>ARRAY</var> are shifted |
| by <var>SHIFT</var> places. If rank is greater than one, then all complete rank one |
| sections of <var>ARRAY</var> along the given dimension are shifted. Elements |
| shifted out one end of each rank one section are shifted back in the other end. |
| </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 = CSHIFT(ARRAY, SHIFT [, DIM])</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>SHIFT</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr> |
| <tr><td width="15%"><var>DIM</var></td><td width="70%">The type shall be <code>INTEGER</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>Returns an array of same type and rank as the <var>ARRAY</var> argument. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_cshift |
| integer, dimension(3,3) :: a |
| a = reshape( (/ 1, 2, 3, 4, 5, 6, 7, 8, 9 /), (/ 3, 3 /)) |
| print '(3i3)', a(1,:) |
| print '(3i3)', a(2,:) |
| print '(3i3)', a(3,:) |
| a = cshift(a, SHIFT=(/1, 2, -1/), DIM=2) |
| print * |
| print '(3i3)', a(1,:) |
| print '(3i3)', a(2,:) |
| print '(3i3)', a(3,:) |
| end program test_cshift |
| </pre></div> |
| </dd> |
| </dl> |
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