<?php
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/**
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*
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* Function code for the complex rho() 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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* Returns the rho of a complex number.
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* This is the distance/radius from the centrepoint to the representation of the number in polar coordinates.
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*
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* @param Complex|mixed $complex Complex number or a numeric value.
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* @return float The rho value of the complex argument.
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* @throws Exception If argument isn't a valid real or complex number.
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*/
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function rho($complex)
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{
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$complex = Complex::validateComplexArgument($complex);
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return \sqrt(
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($complex->getReal() * $complex->getReal()) +
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($complex->getImaginary() * $complex->getImaginary())
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);
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}
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