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KaiserBFunction.h
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1 //# KaiserBFunction.h: A one dimensional Kaiser-Bessel function
2 //# Copyright (C) 2002,2005
3 //# Associated Universities, Inc. Washington DC, USA.
4 //#
5 //# This library is free software; you can redistribute it and/or modify it
6 //# under the terms of the GNU Library General Public License as published by
7 //# the Free Software Foundation; either version 2 of the License, or (at your
8 //# option) any later version.
9 //#
10 //# This library is distributed in the hope that it will be useful, but WITHOUT
11 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13 //# License for more details.
14 //#
15 //# You should have received a copy of the GNU Library General Public License
16 //# along with this library; if not, write to the Free Software Foundation,
17 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 //#
19 //# Correspondence concerning AIPS++ should be addressed as follows:
20 //# Internet email: aips2-request@nrao.edu.
21 //# Postal address: AIPS++ Project Office
22 //# National Radio Astronomy Observatory
23 //# 520 Edgemont Road
24 //# Charlottesville, VA 22903-2475 USA
25 //#
26 //# $Id$
27 
28 #ifndef SCIMATH_KAISERBFUNCTION_H
29 #define SCIMATH_KAISERBFUNCTION_H
30 
31 //# Includes
32 #include <casacore/casa/aips.h>
35 
36 namespace casacore { //# NAMESPACE CASACORE - BEGIN
37 
38 //# Forward declarations
39 
40 // <summary> A one dimensional Kaiser-Bessel function
41 // </summary>
42 
43 // <use visibility=export>
44 
45 // <reviewed reviewer="" date="" tests="tFunctionHolder"
46 // demos="">
47 // </reviewed>
48 
49 // <prerequisite>
50 // <li> <linkto class="KaiserBParam">KaiserBParam</linkto>
51 // <li> <linkto class="Function">Function</linkto>
52 // </prerequisite>
53 
54 // <etymology>
55 // A Kaiser-Bessel function
56 // </etymology>
57 
58 // <synopsis>
59 // A <src>Kaiser-Bessel</src> is described by a height, a center, a width
60 // (halfwidth) and a parameter.
61 // The parameters are enumerated by HEIGHT, CENTER, WIDTH, KBPAR. They have
62 // default values of (1, 0, 1, 2.5).
63 // </synopsis>
64 //
65 // <example>
66 // <srcblock>
67 // KaiserBFunction<Double> sf;
68 // sf(0); // = 1.0
69 // </srcblock>
70 // </example>
71 
72 // <templating arg=T>
73 // <li> T should have standard numerical operators
74 // </templating>
75 
76 // <thrown>
77 // <li> AipsError if incorrect parameter number specified.
78 // </thrown>
79 //
80 
81 template<class T> class KaiserBFunction : public KaiserBParam<T>
82 {
83 public:
84  //# Constructors
85  // Constructs the KaiserBFunction, Defaults:
86  // height=1, center=0, width=1, kbpar=2.5.
87  // <note role=warning> Could not use default arguments
88  // that worked both with gcc and IRIX </note>
89  // <group>
91  explicit KaiserBFunction(const T &kbpar) :
92  KaiserBParam<T>(kbpar) {}
93  // </group>
94 
95  // Copy constructor (deep copy)
96  // <group>
97  KaiserBFunction(const KaiserBFunction<T> &other) : KaiserBParam<T>(other) {}
98  template <class W>
99  KaiserBFunction(const KaiserBFunction<W> &other) : KaiserBParam<T>(other) {}
100  // </group>
101 
102 
103  // Copy assignment (deep copy)
105  KaiserBParam<T>::operator=(other); return *this; }
106 
107  // Destructor
108  virtual ~KaiserBFunction() {}
109 
110  //# Operators
111  // Evaluate the KaiserB at <src>x</src>.
112  // If a vector is used as the argument only its first element is used.
113  // <group>
114  virtual T eval(typename Function<T>::FunctionArg x) const;
115  // </group>
116 
117  //# Member functions
118  // Return a copy of this object from the heap. The caller is responsible
119  // for deleting this pointer.
120  // <group>
121  virtual Function<T> *clone() const { return new KaiserBFunction<T>(*this); }
126 
127  // </group>
128 
129  //# Make members of parent classes known.
130 protected:
132 public:
137 };
138 
139 
140 } //# NAMESPACE CASACORE - END
141 
142 #ifndef CASACORE_NO_AUTO_TEMPLATES
143 #include <casacore/scimath/Functionals/KaiserBFunction.tcc>
144 #endif //# CASACORE_NO_AUTO_TEMPLATES
145 #endif
virtual Function< T > * clone() const
Return a copy of this object from the heap.
KaiserBFunction(const KaiserBFunction< W > &other)
A one dimensional Kaiser-Bessel function.
Definition: KaiserBParam.h:80
KaiserBParam< T > & operator=(const KaiserBParam< T > &other)
Copy assignment (deep copy)
KaiserBFunction(const T &kbpar)
KaiserBFunction(const KaiserBFunction< T > &other)
Copy constructor (deep copy)
A one dimensional Kaiser-Bessel function.
KaiserBFunction()
Constructs the KaiserBFunction, Defaults: height=1, center=0, width=1, kbpar=2.5. ...
Numerical functional interface class.
virtual ~KaiserBFunction()
Destructor.
KaiserBFunction< T > & operator=(const KaiserBFunction< T > &other)
Copy assignment (deep copy)
virtual Function< typename FunctionTraits< T >::BaseType > * cloneNonAD() const
virtual T eval(typename Function< T >::FunctionArg x) const
Evaluate the KaiserB at x.
virtual Function< typename FunctionTraits< T >::DiffType > * cloneAD() const
#define casacore
&lt;X11/Intrinsic.h&gt; #defines true, false, casacore::Bool, and String.
Definition: X11Intrinsic.h:42