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<h3 class="section">8.54 <code>COUNT</code> — Count function</h3>
<p><a name="index-COUNT-523"></a><a name="index-array_002c-conditionally-count-elements-524"></a><a name="index-array_002c-element-counting-525"></a><a name="index-array_002c-number-of-elements-526"></a>
<dl>
<dt><em>Description</em>:<dd>
Counts the number of <code>.TRUE.</code> elements in a logical <var>MASK</var>,
or, if the <var>DIM</var> argument is supplied, counts the number of
elements along each row of the array in the <var>DIM</var> direction.
If the array has zero size, or all of the elements of <var>MASK</var> are
<code>.FALSE.</code>, then the result is <code>0</code>.
<br><dt><em>Standard</em>:<dd>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later
<br><dt><em>Class</em>:<dd>Transformational function
<br><dt><em>Syntax</em>:<dd><code>RESULT = COUNT(MASK [, DIM, KIND])</code>
<br><dt><em>Arguments</em>:<dd>
<p><table summary=""><tr align="left"><td valign="top" width="15%"><var>MASK</var> </td><td valign="top" width="70%">The type shall be <code>LOGICAL</code>.
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>DIM</var> </td><td valign="top" width="70%">(Optional) The type shall be <code>INTEGER</code>.
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>KIND</var> </td><td valign="top" width="70%">(Optional) An <code>INTEGER</code> initialization
expression indicating the kind parameter of the result.
<br></td></tr></table>
<br><dt><em>Return value</em>:<dd>The return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If
<var>KIND</var> is absent, the return value is of default integer kind.
If <var>DIM</var> is present, the result is an array with a rank one less
than the rank of <var>ARRAY</var>, and a size corresponding to the shape
of <var>ARRAY</var> with the <var>DIM</var> dimension removed.
<br><dt><em>Example</em>:<dd>
<pre class="smallexample"> program test_count
integer, dimension(2,3) :: a, b
logical, dimension(2,3) :: mask
a = reshape( (/ 1, 2, 3, 4, 5, 6 /), (/ 2, 3 /))
b = reshape( (/ 0, 7, 3, 4, 5, 8 /), (/ 2, 3 /))
print '(3i3)', a(1,:)
print '(3i3)', a(2,:)
print *
print '(3i3)', b(1,:)
print '(3i3)', b(2,:)
print *
mask = a.ne.b
print '(3l3)', mask(1,:)
print '(3l3)', mask(2,:)
print *
print '(3i3)', count(mask)
print *
print '(3i3)', count(mask, 1)
print *
print '(3i3)', count(mask, 2)
end program test_count
</pre>
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