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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\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;

class BesselI
{
    use ArrayEnabled;

/**
     * BESSELI.
     *
     *    Returns the modified Bessel function In(x), which is equivalent to the Bessel function evaluated
     *        for purely imaginary arguments
     *
     *    Excel Function:
     *        BESSELI(x,ord)
     *
     * NOTE: The MS Excel implementation of the BESSELI function is still not accurate.
     *       This code provides a more accurate calculation
     *
     * @param mixed $x A float value at which to evaluate the function.
     *                                If x is nonnumeric, BESSELI returns the #VALUE! error value.
     *                      Or can be an array of values
     * @param mixed $ord The integer order of the Bessel function.
     *                                If ord is not an integer, it is truncated.
     *                                If $ord is nonnumeric, BESSELI returns the #VALUE! error value.
     *                                If $ord < 0, BESSELI returns the #NUM! error value.
     *                      Or can be an array of values
     *
     * @return array|float|string Result, or a string containing an error
     *         If an array of numbers is passed as an argument, then the returned result will also be an array
     *            with the same dimensions
     */
    public static function BESSELI($x, $ord)
    {
        if (is_array($x) || is_array($ord)) {
            return self::evaluateArrayArguments([self::class, __FUNCTION__], $x, $ord);
        }

try {
            $x = EngineeringValidations::validateFloat($x);
            $ord = EngineeringValidations::validateInt($ord);
        } catch (Exception $e) {
            return $e->getMessage();
        }

if ($ord < 0) {
            return ExcelError::NAN();
        }

$fResult = self::calculate($x, $ord);

return (is_nan($fResult)) ? ExcelError::NAN() : $fResult;
    }

private static function calculate(float $x, int $ord): float
    {
        // special cases
        switch ($ord) {
            case 0:
                return self::besselI0($x);
            case 1:
                return self::besselI1($x);
        }

return self::besselI2($x, $ord);
    }

private static function besselI0(float $x): float
    {
        $ax = abs($x);

if ($ax < 3.75) {
            $y = $x / 3.75;
            $y = $y * $y;

return 1.0 + $y * (3.5156229 + $y * (3.0899424 + $y * (1.2067492
                                + $y * (0.2659732 + $y * (0.360768e-1 + $y * 0.45813e-2)))));
        }

$y = 3.75 / $ax;

return (exp($ax) / sqrt($ax)) * (0.39894228 + $y * (0.1328592e-1 + $y * (0.225319e-2 + $y * (-0.157565e-2
                            + $y * (0.916281e-2 + $y * (-0.2057706e-1 + $y * (0.2635537e-1 +
                                        $y * (-0.1647633e-1 + $y * 0.392377e-2))))))));
    }

private static function besselI1(float $x): float
    {
        $ax = abs($x);

if ($ax < 3.75) {
            $y = $x / 3.75;
            $y = $y * $y;
            $ans = $ax * (0.5 + $y * (0.87890594 + $y * (0.51498869 + $y * (0.15084934 + $y * (0.2658733e-1 +
                                    $y * (0.301532e-2 + $y * 0.32411e-3))))));

return ($x < 0.0) ? -$ans : $ans;
        }

$y = 3.75 / $ax;
        $ans = 0.2282967e-1 + $y * (-0.2895312e-1 + $y * (0.1787654e-1 - $y * 0.420059e-2));
        $ans = 0.39894228 + $y * (-0.3988024e-1 + $y * (-0.362018e-2 + $y * (0.163801e-2 +
                        $y * (-0.1031555e-1 + $y * $ans))));
        $ans *= exp($ax) / sqrt($ax);

return ($x < 0.0) ? -$ans : $ans;
    }

/**
     * Sop to Scrutinizer.
     *
     * @var float
     */
    private static $zeroPointZero = 0.0;

private static function besselI2(float $x, int $ord): float
    {
        if ($x === self::$zeroPointZero) {
            return 0.0;
        }

$tox = 2.0 / abs($x);
        $bip = 0;
        $ans = 0.0;
        $bi = 1.0;

for ($j = 2 * ($ord + (int) sqrt(40.0 * $ord)); $j > 0; --$j) {
            $bim = $bip + $j * $tox * $bi;
            $bip = $bi;
            $bi = $bim;

if (abs($bi) > 1.0e+12) {
                $ans *= 1.0e-12;
                $bi *= 1.0e-12;
                $bip *= 1.0e-12;
            }

if ($j === $ord) {
                $ans = $bip;
            }
        }

$ans *= self::besselI0($x) / $bi;

return ($x < 0.0 && (($ord % 2) === 1)) ? -$ans : $ans;
    }
}

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