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<p>
Next: <a href="COTAN.html#COTAN" accesskey="n" rel="next">COTAN</a>, Previous: <a href="COSD.html#COSD" accesskey="p" rel="prev">COSD</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> &nbsp; [<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>
<a name="COSH-_002d_002d_002d-Hyperbolic-cosine-function"></a>
<h3 class="section">9.75 <code>COSH</code> &mdash; Hyperbolic cosine function</h3>
<a name="index-COSH"></a>
<a name="index-DCOSH"></a>
<a name="index-hyperbolic-cosine"></a>
<a name="index-hyperbolic-function_002c-cosine"></a>
<a name="index-cosine_002c-hyperbolic"></a>

<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p><code>COSH(X)</code> computes the hyperbolic cosine of <var>X</var>.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>Fortran 77 and later, for a complex argument Fortran 2008 or later
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Elemental function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>X = COSH(X)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code> or <code>COMPLEX</code>.</td></tr>
</table>

</dd>
<dt><em>Return value</em>:</dt>
<dd><p>The return value has same type and kind as <var>X</var>. If <var>X</var> is
complex, the imaginary part of the result is in radians. If <var>X</var>
is <code>REAL</code>, the return value has a lower bound of one,
<em>\cosh (x) \geq 1</em>.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">program test_cosh
  real(8) :: x = 1.0_8
  x = cosh(x)
end program test_cosh
</pre></div>

</dd>
<dt><em>Specific names</em>:</dt>
<dd><table>
<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
<tr><td width="20%"><code>COSH(X)</code></td><td width="20%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
<tr><td width="20%"><code>DCOSH(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 77 and later</td></tr>
</table>

</dd>
<dt><em>See also</em>:</dt>
<dd><p>Inverse function: <a href="ACOSH.html#ACOSH">ACOSH</a>
</p>
</dd>
</dl>


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