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| <title>The GNU Fortran Compiler: EOSHIFT</title> |
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| <a name="EOSHIFT-_002d_002d_002d-End_002doff-shift-elements-of-an-array"></a> |
| <h3 class="section">8.72 <code>EOSHIFT</code> — End-off shift elements of an array</h3> |
| <a name="index-EOSHIFT"></a> |
| <a name="index-array_002c-shift"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>EOSHIFT(ARRAY, SHIFT[, BOUNDARY, DIM])</code> performs an end-off 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 dropped. If |
| <var>BOUNDARY</var> is present then the corresponding value of from <var>BOUNDARY</var> |
| is copied back in the other end. If <var>BOUNDARY</var> is not present then the |
| following are copied in depending on the type of <var>ARRAY</var>. |
| </p> |
| <table> |
| <tr><td width="15%"><em>Array Type</em></td><td width="80%"><em>Boundary Value</em></td></tr> |
| <tr><td width="15%">Numeric</td><td width="80%">0 of the type and kind of <var>ARRAY</var>.</td></tr> |
| <tr><td width="15%">Logical</td><td width="80%"><code>.FALSE.</code>.</td></tr> |
| <tr><td width="15%">Character(<var>len</var>)</td><td width="80%"><var>len</var> blanks.</td></tr> |
| </table> |
| |
| </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 = EOSHIFT(ARRAY, SHIFT [, BOUNDARY, DIM])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>ARRAY</var></td><td width="70%">May be any type, not scalar.</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>BOUNDARY</var></td><td width="70%">Same type as <var>ARRAY</var>.</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_eoshift |
| 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 = EOSHIFT(a, SHIFT=(/1, 2, 1/), BOUNDARY=-5, DIM=2) |
| print * |
| print '(3i3)', a(1,:) |
| print '(3i3)', a(2,:) |
| print '(3i3)', a(3,:) |
| end program test_eoshift |
| </pre></div> |
| </dd> |
| </dl> |
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