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<?php |
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|
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/** |
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* |
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* Function code for the complex asech() function |
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* |
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* @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) |
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* @license https://opensource.org/licenses/MIT MIT |
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*/ |
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namespace Complex; |
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|
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/** |
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* Returns the inverse hyperbolic secant of a complex number. |
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* |
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* @param Complex|mixed $complex Complex number or a numeric value. |
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* @return Complex The inverse hyperbolic secant of the complex argument. |
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* @throws Exception If argument isn't a valid real or complex number. |
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* @throws \InvalidArgumentException If function would result in a division by zero |
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*/ |
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function asech($complex) |
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{ |
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$complex = Complex::validateComplexArgument($complex); |
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|
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if ($complex->getReal() == 0.0 && $complex->getImaginary() == 0.0) { |
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return INF; |
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} |
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|
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return acosh(inverse($complex)); |
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} |
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|
