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<?php |
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namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical; |
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use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled; |
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use PhpOffice\PhpSpreadsheet\Calculation\Exception; |
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use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError; |
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use PhpOffice\PhpSpreadsheet\Calculation\MathTrig; |
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use PhpOffice\PhpSpreadsheet\Shared\IntOrFloat; |
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class Permutations |
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{ |
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use ArrayEnabled; |
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/** |
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* PERMUT. |
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* |
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* Returns the number of permutations for a given number of objects that can be |
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* selected from number objects. A permutation is any set or subset of objects or |
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* events where internal order is significant. Permutations are different from |
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* combinations, for which the internal order is not significant. Use this function |
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* for lottery-style probability calculations. |
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* |
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* @param mixed $numObjs Integer number of different objects |
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* Or can be an array of values |
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* @param mixed $numInSet Integer number of objects in each permutation |
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* Or can be an array of values |
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* |
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* @return array|float|int|string Number of permutations, or a string containing an error |
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* If an array of numbers is passed as an argument, then the returned result will also be an array |
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* with the same dimensions |
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*/ |
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public static function PERMUT($numObjs, $numInSet) |
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{ |
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if (is_array($numObjs) || is_array($numInSet)) { |
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return self::evaluateArrayArguments([self::class, __FUNCTION__], $numObjs, $numInSet); |
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} |
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try { |
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$numObjs = StatisticalValidations::validateInt($numObjs); |
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$numInSet = StatisticalValidations::validateInt($numInSet); |
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} catch (Exception $e) { |
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return $e->getMessage(); |
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} |
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if ($numObjs < $numInSet) { |
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return ExcelError::NAN(); |
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} |
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$result1 = MathTrig\Factorial::fact($numObjs); |
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if (is_string($result1)) { |
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return $result1; |
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} |
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$result2 = MathTrig\Factorial::fact($numObjs - $numInSet); |
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if (is_string($result2)) { |
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return $result2; |
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} |
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// phpstan thinks result1 and result2 can be arrays; they can't. |
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$result = round($result1 / $result2); // @phpstan-ignore-line |
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return IntOrFloat::evaluate($result); |
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} |
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/** |
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* PERMUTATIONA. |
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* |
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* Returns the number of permutations for a given number of objects (with repetitions) |
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* that can be selected from the total objects. |
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* |
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* @param mixed $numObjs Integer number of different objects |
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* Or can be an array of values |
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* @param mixed $numInSet Integer number of objects in each permutation |
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* Or can be an array of values |
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* |
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* @return array|float|int|string Number of permutations, or a string containing an error |
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* If an array of numbers is passed as an argument, then the returned result will also be an array |
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* with the same dimensions |
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*/ |
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public static function PERMUTATIONA($numObjs, $numInSet) |
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{ |
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if (is_array($numObjs) || is_array($numInSet)) { |
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return self::evaluateArrayArguments([self::class, __FUNCTION__], $numObjs, $numInSet); |
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} |
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try { |
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$numObjs = StatisticalValidations::validateInt($numObjs); |
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$numInSet = StatisticalValidations::validateInt($numInSet); |
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} catch (Exception $e) { |
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return $e->getMessage(); |
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} |
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if ($numObjs < 0 || $numInSet < 0) { |
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return ExcelError::NAN(); |
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} |
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$result = $numObjs ** $numInSet; |
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return IntOrFloat::evaluate($result); |
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} |
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} |
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PHPOffice /
PhpSpreadsheet
