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| <a name="TANH-_002d_002d_002d-Hyperbolic-tangent-function"></a> |
| <h3 class="section">8.241 <code>TANH</code> — Hyperbolic tangent function</h3> |
| <a name="index-TANH"></a> |
| <a name="index-DTANH"></a> |
| <a name="index-hyperbolic-tangent"></a> |
| <a name="index-hyperbolic-function_002c-tangent"></a> |
| <a name="index-tangent_002c-hyperbolic"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>TANH(X)</code> computes the hyperbolic tangent 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 = TANH(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 lies in the range |
| <em>- 1 \leq tanh(x) \leq 1 </em>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_tanh |
| real(8) :: x = 2.1_8 |
| x = tanh(x) |
| end program test_tanh |
| </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>TANH(X)</code></td><td width="20%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| <tr><td width="20%"><code>DTANH(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="ATANH.html#ATANH">ATANH</a> |
| </p></dd> |
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