<?php
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/**
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*
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* Function code for the complex atan() 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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//include_once 'Math/Complex.php';
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//include_once 'Math/ComplexOp.php';
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/**
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* Returns the inverse tangent of a complex number.
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*
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* @param Complex|mixed $complex Complex number or a numeric value.
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* @return Complex The inverse tangent of the complex argument.
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* @throws Exception If argument isn't a valid real or complex number.
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* @throws \InvalidArgumentException If function would result in a division by zero
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*/
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function atan($complex)
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{
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$complex = Complex::validateComplexArgument($complex);
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if ($complex->isReal()) {
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return new Complex(\atan($complex->getReal()));
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}
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$t1Value = new Complex(-1 * $complex->getImaginary(), $complex->getReal());
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$uValue = new Complex(1, 0);
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$d1Value = clone $uValue;
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$d1Value = subtract($d1Value, $t1Value);
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$d2Value = add($t1Value, $uValue);
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$uResult = $d1Value->divideBy($d2Value);
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$uResult = ln($uResult);
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return new Complex(
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(($uResult->getImaginary() == M_PI) ? -M_PI : $uResult->getImaginary()) * -0.5,
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$uResult->getReal() * 0.5,
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$complex->getSuffix()
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);
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}
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