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<?php |
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|
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namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation\MathTrig; |
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|
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use TablePress\PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled; |
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use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Exception; |
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use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Functions; |
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|
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class SeriesSum |
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{ |
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use ArrayEnabled; |
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|
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/** |
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* SERIESSUM. |
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* |
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* Returns the sum of a power series |
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* |
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* @param mixed $x Input value |
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* @param mixed $n Initial power |
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* @param mixed $m Step |
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* @param mixed[] $args An array of coefficients for the Data Series |
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* |
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* @return array<mixed>|float|int|string The result, or a string containing an error |
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*/ |
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public static function evaluate($x, $n, $m, ...$args) |
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{ |
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if (is_array($x) || is_array($n) || is_array($m)) { |
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return self::evaluateArrayArgumentsSubset([self::class, __FUNCTION__], 3, $x, $n, $m, ...$args); |
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} |
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|
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try { |
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$x = Helpers::validateNumericNullSubstitution($x, 0); |
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$n = Helpers::validateNumericNullSubstitution($n, 0); |
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$m = Helpers::validateNumericNullSubstitution($m, 0); |
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|
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// Loop through arguments |
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$aArgs = Functions::flattenArray($args); |
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$returnValue = 0; |
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$i = 0; |
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foreach ($aArgs as $argx) { |
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if ($argx !== null) { |
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$arg = Helpers::validateNumericNullSubstitution($argx, 0); |
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$returnValue += $arg * $x ** ($n + ($m * $i)); |
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++$i; |
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} |
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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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|
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return $returnValue; |
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} |
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} |
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