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26 <div class=
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27 <a name=
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"Airy Bi Function">Airy Bi Function
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28 </h3></div></div></div>
30 <a name=
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31 <span class=
"phrase"><a name=
"math_toolkit.airy.bi.synopsis"></a></span><a class=
"link" href=
"bi.html#math_toolkit.airy.bi.synopsis">Synopsis
</a>
33 <pre class=
"programlisting"><span class=
"preprocessor">#include
</span> <span class=
"special"><</span><span class=
"identifier">boost
</span><span class=
"special">/
</span><span class=
"identifier">math
</span><span class=
"special">/
</span><span class=
"identifier">special_functions
</span><span class=
"special">/
</span><span class=
"identifier">airy
</span><span class=
"special">.
</span><span class=
"identifier">hpp
</span><span class=
"special">></span>
35 <pre class=
"programlisting"><span class=
"keyword">namespace
</span> <span class=
"identifier">boost
</span> <span class=
"special">{
</span> <span class=
"keyword">namespace
</span> <span class=
"identifier">math
</span> <span class=
"special">{
</span>
37 <span class=
"keyword">template
</span> <span class=
"special"><</span><span class=
"keyword">class
</span> <span class=
"identifier">T
</span><span class=
"special">></span>
38 <a class=
"link" href=
"../result_type.html" title=
"Calculation of the Type of the Result"><span class=
"emphasis"><em>calculated-result-type
</em></span></a> <span class=
"identifier">airy_bi
</span><span class=
"special">(
</span><span class=
"identifier">T
</span> <span class=
"identifier">x
</span><span class=
"special">);
</span>
40 <span class=
"keyword">template
</span> <span class=
"special"><</span><span class=
"keyword">class
</span> <span class=
"identifier">T
</span><span class=
"special">,
</span> <span class=
"keyword">class
</span> <span class=
"identifier">Policy
</span><span class=
"special">></span>
41 <a class=
"link" href=
"../result_type.html" title=
"Calculation of the Type of the Result"><span class=
"emphasis"><em>calculated-result-type
</em></span></a> <span class=
"identifier">airy_bi
</span><span class=
"special">(
</span><span class=
"identifier">T
</span> <span class=
"identifier">x
</span><span class=
"special">,
</span> <span class=
"keyword">const
</span> <span class=
"identifier">Policy
</span><span class=
"special">&);
</span>
43 <span class=
"special">}}
</span> <span class=
"comment">// namespaces
</span>
46 <a name=
"math_toolkit.airy.bi.h1"></a>
47 <span class=
"phrase"><a name=
"math_toolkit.airy.bi.description"></a></span><a class=
"link" href=
"bi.html#math_toolkit.airy.bi.description">Description
</a>
50 The function
<a class=
"link" href=
"bi.html" title=
"Airy Bi Function">airy_bi
</a> calculates
51 the Airy function Bi which is the second solution to the differential equation:
54 <span class=
"inlinemediaobject"><img src=
"../../../equations/airy.svg"></span>
57 The final
<a class=
"link" href=
"../../policy.html" title=
"Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy
</a> argument is optional and can
58 be used to control the behaviour of the function: how it handles errors,
59 what level of precision to use etc. Refer to the
<a class=
"link" href=
"../../policy.html" title=
"Chapter 15. Policies: Controlling Precision, Error Handling etc">policy
60 documentation for more details
</a>.
63 The following graph illustrates how this function changes as
<span class=
"emphasis"><em>x
</em></span>
64 changes: for negative
<span class=
"emphasis"><em>x
</em></span> the function is cyclic, while
65 for positive
<span class=
"emphasis"><em>x
</em></span> the value tends to infinity:
68 <span class=
"inlinemediaobject"><img src=
"../../../graphs/airy_bi.svg" align=
"middle"></span>
71 <a name=
"math_toolkit.airy.bi.h2"></a>
72 <span class=
"phrase"><a name=
"math_toolkit.airy.bi.accuracy"></a></span><a class=
"link" href=
"bi.html#math_toolkit.airy.bi.accuracy">Accuracy
</a>
75 This function is implemented entirely in terms of the Bessel functions
<a class=
"link" href=
"../bessel/mbessel.html" title=
"Modified Bessel Functions of the First and Second Kinds">cyl_bessel_i
</a> and
<a class=
"link" href=
"../bessel/bessel_first.html" title=
"Bessel Functions of the First and Second Kinds">cyl_bessel_j
</a>
76 - refer to those functions for detailed accuracy information.
79 In general though, the relative error is low (less than
100 ε) for
<span class=
"emphasis"><em>x
80 > 0</em></span> while only the absolute error is low for
<span class=
"emphasis"><em>x
<
84 <a name=
"math_toolkit.airy.bi.h3"></a>
85 <span class=
"phrase"><a name=
"math_toolkit.airy.bi.testing"></a></span><a class=
"link" href=
"bi.html#math_toolkit.airy.bi.testing">Testing
</a>
88 Since this function is implemented in terms of other special functions, there
89 are only a few basic sanity checks, using test values from
<a href=
"http://functions.wolfram.com" target=
"_top">functions.wolfram.com
</a>.
92 <a name=
"math_toolkit.airy.bi.h4"></a>
93 <span class=
"phrase"><a name=
"math_toolkit.airy.bi.implementation"></a></span><a class=
"link" href=
"bi.html#math_toolkit.airy.bi.implementation">Implementation
</a>
96 This function is implemented in terms of the Bessel functions using the relations:
99 <span class=
"inlinemediaobject"><img src=
"../../../equations/airy_bi.svg"></span>
102 <table xmlns:
rev=
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103 <td align=
"left"></td>
104 <td align=
"right"><div class=
"copyright-footer">Copyright
© 2006-
2010,
2012-
2014 Nikhar Agrawal,
105 Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
106 Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan R
åde, Gautam Sewani,
107 Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang
<p>
108 Distributed under the Boost Software License, Version
1.0. (See accompanying
109 file LICENSE_1_0.txt or copy at
<a href=
"http://www.boost.org/LICENSE_1_0.txt" target=
"_top">http://www.boost.org/LICENSE_1_0.txt
</a>)
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