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<title>The GNU Fortran Compiler: CSHIFT</title>

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<a name="CSHIFT-_002d_002d_002d-Circular-shift-elements-of-an-array"></a>
<h3 class="section">9.80 <code>CSHIFT</code> &mdash; 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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