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<title>The GNU Fortran Compiler: CO_MAX</title>
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<a name="CO_005fMAX"></a>
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<p>
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Next: <a href="CO_005fMIN.html#CO_005fMIN" accesskey="n" rel="next">CO_MIN</a>, Previous: <a href="CO_005fBROADCAST.html#CO_005fBROADCAST" accesskey="p" rel="prev">CO_BROADCAST</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="CO_005fMAX-_002d_002d_002d-Maximal-value-on-the-current-set-of-images"></a>
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<h3 class="section">9.60 <code>CO_MAX</code> — Maximal value on the current set of images</h3>
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<a name="index-CO_005fMAX"></a>
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<a name="index-Collectives_002c-maximal-value"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>CO_MAX</code> determines element-wise the maximal value of <var>A</var> on all
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images of the current team. If <var>RESULT_IMAGE</var> is present, the maximum
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values are returned in <var>A</var> on the specified image only and the value
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of <var>A</var> on the other images become undefined. If <var>RESULT_IMAGE</var> is
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not present, the value is returned on all images. If the execution was
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successful and <var>STAT</var> is present, it is assigned the value zero. If the
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execution failed, <var>STAT</var> gets assigned a nonzero value and, if present,
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<var>ERRMSG</var> gets assigned a value describing the occurred error.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Technical Specification (TS) 18508 or later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Collective subroutine
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>CALL CO_MAX(A [, RESULT_IMAGE, STAT, ERRMSG])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>A</var></td><td width="70%">shall be an integer, real or character variable,
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which has the same type and type parameters on all images of the team.</td></tr>
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<tr><td width="15%"><var>RESULT_IMAGE</var></td><td width="70%">(optional) a scalar integer expression; if
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present, it shall have the same the same value on all images and refer to an
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image of the current team.</td></tr>
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<tr><td width="15%"><var>STAT</var></td><td width="70%">(optional) a scalar integer variable</td></tr>
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<tr><td width="15%"><var>ERRMSG</var></td><td width="70%">(optional) a scalar character variable</td></tr>
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</table>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test
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integer :: val
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val = this_image ()
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call co_max (val, result_image=1)
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if (this_image() == 1) then
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write(*,*) "Maximal value", val ! prints num_images()
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end if
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end program test
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</pre></div>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="CO_005fMIN.html#CO_005fMIN">CO_MIN</a>, <a href="CO_005fSUM.html#CO_005fSUM">CO_SUM</a>, <a href="CO_005fREDUCE.html#CO_005fREDUCE">CO_REDUCE</a>, <a href="CO_005fBROADCAST.html#CO_005fBROADCAST">CO_BROADCAST</a>
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</p></dd>
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