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