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| <h3 class="section">8.7 <code>ACOSH</code> — Inverse hyperbolic cosine function</h3> |
| |
| <p><a name="index-ACOSH-390"></a><a name="index-DACOSH-391"></a><a name="index-area-hyperbolic-cosine-392"></a><a name="index-inverse-hyperbolic-cosine-393"></a><a name="index-hyperbolic-function_002c-cosine_002c-inverse-394"></a><a name="index-cosine_002c-hyperbolic_002c-inverse-395"></a> |
| <dl> |
| <dt><em>Description</em>:<dd><code>ACOSH(X)</code> computes the inverse hyperbolic cosine of <var>X</var>. |
| |
| <br><dt><em>Standard</em>:<dd>Fortran 2008 and later |
| |
| <br><dt><em>Class</em>:<dd>Elemental function |
| |
| <br><dt><em>Syntax</em>:<dd><code>RESULT = ACOSH(X)</code> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>X</var> </td><td valign="top" width="70%">The type shall be <code>REAL</code> or <code>COMPLEX</code>. |
| <br></td></tr></table> |
| |
| <br><dt><em>Return value</em>:<dd>The return value has the same type and kind as <var>X</var>. If <var>X</var> is |
| complex, the imaginary part of the result is in radians and lies between |
| 0 \leq \Im \acosh(x) \leq \pi. |
| |
| <br><dt><em>Example</em>:<dd> |
| <pre class="smallexample"> PROGRAM test_acosh |
| REAL(8), DIMENSION(3) :: x = (/ 1.0, 2.0, 3.0 /) |
| WRITE (*,*) ACOSH(x) |
| END PROGRAM |
| </pre> |
| <br><dt><em>Specific names</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="20%">Name </td><td valign="top" width="20%">Argument </td><td valign="top" width="20%">Return type </td><td valign="top" width="25%">Standard |
| <br></td></tr><tr align="left"><td valign="top" width="20%"><code>DACOSH(X)</code> </td><td valign="top" width="20%"><code>REAL(8) X</code> </td><td valign="top" width="20%"><code>REAL(8)</code> </td><td valign="top" width="25%">GNU extension |
| <br></td></tr></table> |
| |
| <br><dt><em>See also</em>:<dd>Inverse function: <a href="COSH.html#COSH">COSH</a> |
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