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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">9.93 <code>EOSHIFT</code> &mdash; 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>
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