92 lines
3.5 KiB
PHP
92 lines
3.5 KiB
PHP
<?php
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namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
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use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
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use PhpOffice\PhpSpreadsheet\Calculation\Exception;
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class Combinations
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{
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use ArrayEnabled;
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/**
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* COMBIN.
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*
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* Returns the number of combinations for a given number of items. Use COMBIN to
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* determine the total possible number of groups for a given number of items.
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*
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* Excel Function:
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* COMBIN(numObjs,numInSet)
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*
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* @param mixed $numObjs Number of different objects, or can be an array of numbers
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* @param mixed $numInSet Number of objects in each combination, or can be an array of numbers
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*
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* @return array|float|int|string Number of combinations, or a string containing an error
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* If an array of numbers is passed as the argument, then the returned result will also be an array
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* with the same dimensions
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*/
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public static function withoutRepetition($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 = Helpers::validateNumericNullSubstitution($numObjs, null);
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$numInSet = Helpers::validateNumericNullSubstitution($numInSet, null);
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Helpers::validateNotNegative($numInSet);
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Helpers::validateNotNegative($numObjs - $numInSet);
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} catch (Exception $e) {
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return $e->getMessage();
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}
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return round(Factorial::fact($numObjs) / Factorial::fact($numObjs - $numInSet)) / Factorial::fact($numInSet); // @phpstan-ignore-line
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}
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/**
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* COMBINA.
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*
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* Returns the number of combinations for a given number of items. Use COMBIN to
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* determine the total possible number of groups for a given number of items.
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*
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* Excel Function:
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* COMBINA(numObjs,numInSet)
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*
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* @param mixed $numObjs Number of different objects, or can be an array of numbers
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* @param mixed $numInSet Number of objects in each combination, or can be an array of numbers
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*
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* @return array|float|int|string Number of combinations, or a string containing an error
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* If an array of numbers is passed as the argument, then the returned result will also be an array
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* with the same dimensions
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*/
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public static function withRepetition($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 = Helpers::validateNumericNullSubstitution($numObjs, null);
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$numInSet = Helpers::validateNumericNullSubstitution($numInSet, null);
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Helpers::validateNotNegative($numInSet);
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Helpers::validateNotNegative($numObjs);
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$numObjs = (int) $numObjs;
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$numInSet = (int) $numInSet;
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// Microsoft documentation says following is true, but Excel
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// does not enforce this restriction.
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//Helpers::validateNotNegative($numObjs - $numInSet);
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if ($numObjs === 0) {
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Helpers::validateNotNegative(-$numInSet);
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return 1;
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}
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} catch (Exception $e) {
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return $e->getMessage();
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}
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return round(
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Factorial::fact($numObjs + $numInSet - 1) / Factorial::fact($numObjs - 1) // @phpstan-ignore-line
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) / Factorial::fact($numInSet);
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}
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}
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