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<?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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use PhpOffice\PhpSpreadsheet\Calculation\Functions;
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class SeriesSum
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{
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use ArrayEnabled;
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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|float|int|string The result, or a string containing an error
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*/
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public static function evaluate(mixed $x, mixed $n, mixed $m, ...$args): array|string|float|int
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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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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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// 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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return $returnValue;
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}
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}
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