reginaldojunior / winners

	 * @param	float		$x		The lower bound for integrating ERF

	 * @return	int

	 */

	public static function ERFC($x) {

		$x	= PHPExcel_Calculation_Functions::flattenSingleValue($x);

		if (is_numeric($x)) {

			if ($x < 0) {

				return PHPExcel_Calculation_Functions::NaN();

			}

			return self::_erfcVal($x);

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function ERFC()

	/**

	 * @param	float	$number		Number

	 * @return	float	Square Root of Number * Pi

	 */

	public static function SQRTPI($number) {

		$number	= PHPExcel_Calculation_Functions::flattenSingleValue($number);

		if (is_numeric($number)) {

			if ($number < 0) {

				return PHPExcel_Calculation_Functions::NaN();

			}

			return sqrt($number * M_PI) ;

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function SQRTPI()

	/**

	 * @param	float		$value

	 * @return	float

	 */

	public static function GAMMALN($value) {

		$value	= PHPExcel_Calculation_Functions::flattenSingleValue($value);

		if (is_numeric($value)) {

			if ($value <= 0) {

				return PHPExcel_Calculation_Functions::NaN();

			}

			return log(self::_gamma($value));

		}

		return PHPExcel_Calculation_Functions::VALUE();

	}	//	function GAMMALN()

	/**