| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* |
| 5 |
* Function code for the complex tanh() function |
| 6 |
* |
| 7 |
* @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) |
| 8 |
* @license https://opensource.org/licenses/MIT MIT |
| 9 |
*/ |
| 10 |
namespace Complex; |
| 11 |
|
| 12 |
/** |
| 13 |
* Returns the hyperbolic tangent of a complex number. |
| 14 |
* |
| 15 |
* @param Complex|mixed $complex Complex number or a numeric value. |
| 16 |
* @return Complex The hyperbolic tangent of the complex argument. |
| 17 |
* @throws Exception If argument isn't a valid real or complex number. |
| 18 |
* @throws \InvalidArgumentException If function would result in a division by zero |
| 19 |
*/ |
| 20 |
function tanh($complex) |
| 21 |
{ |
| 22 |
$complex = Complex::validateComplexArgument($complex); |
| 23 |
$real = $complex->getReal(); |
| 24 |
$imaginary = $complex->getImaginary(); |
| 25 |
$divisor = \cos($imaginary) * \cos($imaginary) + \sinh($real) * \sinh($real); |
| 26 |
if ($divisor == 0.0) { |
| 27 |
throw new \InvalidArgumentException('Division by zero'); |
| 28 |
} |
| 29 |
|
| 30 |
return new Complex( |
| 31 |
\sinh($real) * \cosh($real) / $divisor, |
| 32 |
0.5 * \sin(2 * $imaginary) / $divisor, |
| 33 |
$complex->getSuffix() |
| 34 |
); |
| 35 |
} |
| 36 |
|
