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<?php |
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/** |
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* @package JAMA |
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* |
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* Pythagorean Theorem: |
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* |
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* a = 3 |
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* b = 4 |
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* r = sqrt(square(a) + square(b)) |
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* r = 5 |
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* |
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* r = sqrt(a^2 + b^2) without under/overflow. |
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*/ |
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function hypo($a, $b) { |
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if (abs($a) > abs($b)) { |
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$r = $b / $a; |
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$r = abs($a) * sqrt(1 + $r * $r); |
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} elseif ($b != 0) { |
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$r = $a / $b; |
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$r = abs($b) * sqrt(1 + $r * $r); |
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} else { |
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$r = 0.0; |
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} |
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return $r; |
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} // function hypo() |
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|
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|
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/** |
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* Mike Bommarito's version. |
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* Compute n-dimensional hyotheneuse. |
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* |
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function hypot() { |
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$s = 0; |
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foreach (func_get_args() as $d) { |
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if (is_numeric($d)) { |
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$s += pow($d, 2); |
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} else { |
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throw new PHPExcel_Calculation_Exception(JAMAError(ArgumentTypeException)); |
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} |
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} |
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return sqrt($s); |
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} |
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*/ |
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|
