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| <title>The GNU Fortran Compiler: COSH</title> |
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| <a name="COSH-_002d_002d_002d-Hyperbolic-cosine-function"></a> |
| <h3 class="section">8.56 <code>COSH</code> — 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> |
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