tablepress / libraries / vendor / PhpSpreadsheet / Calculation / Engineering / BesselY.php

BesselY.php in TablePress – Tables in WordPress made easy 3.4, at libraries/vendor/PhpSpreadsheet/Calculation/Engineering/BesselY.php

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1	<?php
2
3	namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation\Engineering;
4
5	use TablePress\PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
6	use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Exception;
7	use TablePress\PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
8
9	class BesselY
10	{
11	use ArrayEnabled;
12
13	/**
14	* BESSELY.
15	*
16	* Returns the Bessel function, which is also called the Weber function or the Neumann function.
17	*
18	* Excel Function:
19	* BESSELY(x,ord)
20	*
21	* @param mixed $x A float value at which to evaluate the function.
22	* If x is nonnumeric, BESSELY returns the #VALUE! error value.
23	* Or can be an array of values
24	* @param mixed $ord The integer order of the Bessel function.
25	* If ord is not an integer, it is truncated.
26	* If $ord is nonnumeric, BESSELY returns the #VALUE! error value.
27	* If $ord < 0, BESSELY returns the #NUM! error value.
28	* Or can be an array of values
29	*
30	* @return array<mixed>\|float\|string Result, or a string containing an error
31	* If an array of numbers is passed as an argument, then the returned result will also be an array
32	* with the same dimensions
33	*/
34	public static function BESSELY($x, $ord)
35	{
36	if (is_array($x) \|\| is_array($ord)) {
37	return self::evaluateArrayArguments([self::class, __FUNCTION__], $x, $ord);
38	}
39
40	try {
41	$x = EngineeringValidations::validateFloat($x);
42	$ord = EngineeringValidations::validateInt($ord);
43	} catch (Exception $e) {
44	return $e->getMessage();
45	}
46
47	if (($ord < 0) \|\| ($x <= 0.0)) {
48	return ExcelError::NAN();
49	}
50
51	$fBy = self::calculate($x, $ord);
52
53	return (is_nan($fBy)) ? ExcelError::NAN() : $fBy;
54	}
55
56	private static function calculate(float $x, int $ord): float
57	{
58	switch ($ord) {
59	case 0:
60	return self::besselY0($x);
61	case 1:
62	return self::besselY1($x);
63	default:
64	return self::besselY2($x, $ord);
65	}
66	}
67
68	/**
69	* Mollify Phpstan.
70	*
71	* @codeCoverageIgnore
72	*/
73	private static function callBesselJ(float $x, int $ord): float
74	{
75	$rslt = BesselJ::BESSELJ($x, $ord);
76	if (!is_float($rslt)) {
77	throw new Exception('Unexpected array or string');
78	}
79
80	return $rslt;
81	}
82
83	private static function besselY0(float $x): float
84	{
85	if ($x < 8.0) {
86	$y = ($x * $x);
87	$ans1 = -2957821389.0 + $y * (7062834065.0 + $y * (-512359803.6 + $y * (10879881.29 + $y
88	* (-86327.92757 + $y * 228.4622733))));
89	$ans2 = 40076544269.0 + $y * (745249964.8 + $y * (7189466.438 + $y
90	* (47447.26470 + $y * (226.1030244 + $y))));
91
92	return $ans1 / $ans2 + 0.636619772 * self::callBesselJ($x, 0) * log($x);
93	}
94
95	$z = 8.0 / $x;
96	$y = ($z * $z);
97	$xx = $x - 0.785398164;
98	$ans1 = 1 + $y * (-0.1098628627e-2 + $y * (0.2734510407e-4 + $y * (-0.2073370639e-5 + $y * 0.2093887211e-6)));
99	$ans2 = -0.1562499995e-1 + $y * (0.1430488765e-3 + $y * (-0.6911147651e-5 + $y * (0.7621095161e-6 + $y
100	* (-0.934945152e-7))));
101
102	return sqrt(0.636619772 / $x) * (sin($xx) * $ans1 + $z * cos($xx) * $ans2);
103	}
104
105	private static function besselY1(float $x): float
106	{
107	if ($x < 8.0) {
108	$y = ($x * $x);
109	$ans1 = $x * (-0.4900604943e13 + $y * (0.1275274390e13 + $y * (-0.5153438139e11 + $y
110	* (0.7349264551e9 + $y * (-0.4237922726e7 + $y * 0.8511937935e4)))));
111	$ans2 = 0.2499580570e14 + $y * (0.4244419664e12 + $y * (0.3733650367e10 + $y * (0.2245904002e8 + $y
112	* (0.1020426050e6 + $y * (0.3549632885e3 + $y)))));
113
114	return ($ans1 / $ans2) + 0.636619772 * (self::callBesselJ($x, 1) * log($x) - 1 / $x);
115	}
116
117	$z = 8.0 / $x;
118	$y = $z * $z;
119	$xx = $x - 2.356194491;
120	$ans1 = 1.0 + $y * (0.183105e-2 + $y * (-0.3516396496e-4 + $y * (0.2457520174e-5 + $y * (-0.240337019e-6))));
121	$ans2 = 0.04687499995 + $y * (-0.2002690873e-3 + $y * (0.8449199096e-5 + $y
122	* (-0.88228987e-6 + $y * 0.105787412e-6)));
123
124	return sqrt(0.636619772 / $x) * (sin($xx) * $ans1 + $z * cos($xx) * $ans2);
125	}
126
127	private static function besselY2(float $x, int $ord): float
128	{
129	$fTox = 2.0 / $x;
130	$fBym = self::besselY0($x);
131	$fBy = self::besselY1($x);
132	for ($n = 1; $n < $ord; ++$n) {
133	$fByp = $n * $fTox * $fBy - $fBym;
134	$fBym = $fBy;
135	$fBy = $fByp;
136	}
137
138	return $fBy;
139	}
140	}
141