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Directory >> /var/www/html/back/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Engineering/

File / Folder	Size	Action
.	-
BesselI.php	4.659KB	edt ren
BesselJ.php	5.783KB	edt ren
BesselK.php	4.242KB	edt ren
BesselY.php	4.801KB	edt ren
BitWise.php	8.09KB	edt ren
Compare.php	2.891KB	edt ren
Complex.php	4.145KB	edt ren
ComplexFunctions.php	19.123KB	edt ren
ComplexOperations.php	4.321KB	edt ren
Constants.php	0.163KB	edt ren
ConvertBase.php	1.928KB	edt ren
ConvertBinary.php	7.09KB	edt ren
ConvertDecimal.php	9.251KB	edt ren
ConvertHex.php	7.545KB	edt ren
ConvertOctal.php	7.388KB	edt ren
ConvertUOM.php	34.951KB	edt ren
EngineeringValidations.php	0.696KB	edt ren
Erf.php	3.456KB	edt ren
ErfC.php	2.394KB	edt ren

<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\Engineering;

use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;

class Erf
{
    use ArrayEnabled;

private const TWO_SQRT_PI = 1.128379167095512574;

/**
     * ERF.
     *
     * Returns the error function integrated between the lower and upper bound arguments.
     *
     *    Note: In Excel 2007 or earlier, if you input a negative value for the upper or lower bound arguments,
     *            the function would return a #NUM! error. However, in Excel 2010, the function algorithm was
     *            improved, so that it can now calculate the function for both positive and negative ranges.
     *            PhpSpreadsheet follows Excel 2010 behaviour, and accepts negative arguments.
     *
     *    Excel Function:
     *        ERF(lower[,upper])
     *
     * @param mixed $lower Lower bound float for integrating ERF
     *                      Or can be an array of values
     * @param mixed $upper Upper bound float for integrating ERF.
     *                           If omitted, ERF integrates between zero and lower_limit
     *                      Or can be an array of values
     *
     * @return array|float|string
     *         If an array of numbers is passed as an argument, then the returned result will also be an array
     *            with the same dimensions
     */
    public static function ERF($lower, $upper = null)
    {
        if (is_array($lower) || is_array($upper)) {
            return self::evaluateArrayArguments([self::class, __FUNCTION__], $lower, $upper);
        }

if (is_numeric($lower)) {
            if ($upper === null) {
                return self::erfValue($lower);
            }
            if (is_numeric($upper)) {
                return self::erfValue($upper) - self::erfValue($lower);
            }
        }

return ExcelError::VALUE();
    }

/**
     * ERFPRECISE.
     *
     * Returns the error function integrated between the lower and upper bound arguments.
     *
     *    Excel Function:
     *        ERF.PRECISE(limit)
     *
     * @param mixed $limit Float bound for integrating ERF, other bound is zero
     *                      Or can be an array of values
     *
     * @return array|float|string
     *         If an array of numbers is passed as an argument, then the returned result will also be an array
     *            with the same dimensions
     */
    public static function ERFPRECISE($limit)
    {
        if (is_array($limit)) {
            return self::evaluateSingleArgumentArray([self::class, __FUNCTION__], $limit);
        }

return self::ERF($limit);
    }

/**
     * Method to calculate the erf value.
     *
     * @param float|int|string $value
     *
     * @return float
     */
    public static function erfValue($value)
    {
        $value = (float) $value;
        if (abs($value) > 2.2) {
            return 1 - ErfC::ERFC($value);
        }
        $sum = $term = $value;
        $xsqr = ($value * $value);
        $j = 1;
        do {
            $term *= $xsqr / $j;
            $sum -= $term / (2 * $j + 1);
            ++$j;
            $term *= $xsqr / $j;
            $sum += $term / (2 * $j + 1);
            ++$j;
            if ($sum == 0.0) {
                break;
            }
        } while (abs($term / $sum) > Functions::PRECISION);

return self::TWO_SQRT_PI * $sum;
    }
}