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Lorentzian1D.h
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1 //# Lorentzian1D.h: A one-dimensional Lorentzian class
2 //# Copyright (C) 1995,1996,1997,2001,2002,2005
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
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25 //#
26 //# $Id$
27 
28 #ifndef SCIMATH_LORENTZIAN1D_H
29 #define SCIMATH_LORENTZIAN1D_H
30 
31 //# Includes
32 #include <casacore/casa/aips.h>
37 
38 namespace casacore { //# NAMESPACE CASACORE - BEGIN
39 
40 //# Forward declarations
41 
42 // <summary> A one dimensional Lorentzian class.</summary>
43 
44 // <use visibility=export>
45 
46 // <reviewed reviewer="tcornwel" date="1996/02/22" tests="tLorentzian1D"
47 // demos="">
48 // </reviewed>
49 
50 // <prerequisite>
51 // <li> <linkto class="Lorentzian1DParam">Lorentzian1DParam</linkto>
52 // <li> <linkto class="Function">Function</linkto>
53 // </prerequisite>
54 
55 // <etymology>
56 // A Lorentzian1D functional is designed exclusively for calculating a
57 // Lorentzian (or Normal) distribution in one dimension.
58 //# Other classes exist (not yet!)
59 //# for calculating these functions in two
60 //# (<linkto class=Lorentzian2D>Lorentzian2D</linkto>) and N
61 //# (<linkto class=LorentzianND>LorentzianND</linkto>) dimensions.
62 // </etymology>
63 
64 // <synopsis>
65 // A <src>Lorentzian1D</src> is described by a height, center, and width. Its
66 // fundamental operation is evaluating itself at some <src>x</src>.
67 // The parameters (height, center and width) may be changed at run time.
68 //
69 // The width of the Lorentzian (for the constructors or the <src>setWidth
70 // </src> function) is always specified in terms of the full width at half
71 // maximum (FWHM). It is always positive and attempts to set a non-positive
72 // width will throw an assertion when in debug mode.
73 //
74 // The peak height of the Lorentzian can be specified at construction time or
75 // by using the <src> setHeight </src> function. Alternatively the <src>
76 // setFlux </src> function can be used to implicitly set the peak height by
77 // specifying the integrated area under the Lorentzian. The height (or flux)
78 // can be positive, negative or zero, as this class makes no assumptions on
79 // what quantity the height represents.
80 //
81 // <note role=tip> Changing the width of the Lorentzian will not affect
82 // its peak height but will change its flux. So you should always set the
83 // width before setting the flux. </note>
84 //
85 // The parameter interface (see
86 // <linkto class="Lorentzian1DParam">Lorentzian1DParam</linkto> class),
87 // is used to provide an interface to the
88 // <linkto module="Fitting">Fitting</linkto> classes.
89 //
90 // There are 3 parameters that are used to describe the Lorentzian:
91 // <ol>
92 // <li> The height of the Lorentzian. This is identical to the value
93 // returned using the <src>height()</src> member function.
94 // <li> The center of the Lorentzian in the x direction. This is identical to
95 // the value returned using the <src>center()</src> member function.
96 // <li> The width (FWHM) of the Lorentzian. To aid convergence of
97 // the non-linear fitting routines this parameter is allowed to be
98 // negative. This does not affect the shape of the Lorentzian as the
99 // square of the width is used when evaluating the function.
100 // </ol>
101 //
102 // An enumeration for the <src>HEIGHT</src>, <src>WIDTH</src> and
103 // <src>CENTER</src> parameter index is provided, enabling the setting
104 // and reading of parameters with the <src>[]</src> operator. The
105 // <src>mask()</src> methods can be used to check and set the parameter masks.
106 //
107 // </synopsis>
108 
109 // <example>
110 // <srcblock>
111 // Lorentzian<Double> gf(5.0, 25.0, 7);
112 // gf(25); // = 5.0
113 // gf[HEIGHT](1.0);
114 // gf.setWidth(2.0);
115 // gf[CENTER](0.0);
116 // gf(1); // = 0.5*height = 0.5
117 // </srcblock>
118 // </example>
119 
120 // <templating arg=T>
121 // <li> T should have standard numerical operators and exp() function. Current
122 // implementation only tested for real types.
123 // <li> To obtain derivatives, the derivatives should be defined.
124 // </templating>
125 
126 // <thrown>
127 // <li> Assertion in debug mode if attempt is made to set a negative width
128 // <li> AipsError if incorrect parameter number specified.
129 // <li> Assertion in debug mode if operator(Vector<>) with empty Vector
130 // </thrown>
131 
132 // <todo asof="2001/08/19">
133 // <li> Lorentzians that know about their DFT's could be required eventually.
134 // </todo>
135 
136 template<class T> class Lorentzian1D : public Lorentzian1DParam<T> {
137 public:
138  //# Enumerations
139 
140  //# Constructors
141  // Constructs the one dimensional Lorentzians. Defaults:
142  // height=1, center=0, width(FWHM)=1.
143  // <note role=warning> Could not use default arguments
144  // that worked both with gcc and IRIX </note>
145  // <group>
147  explicit Lorentzian1D(const T &height) : Lorentzian1DParam<T>(height) {};
148  Lorentzian1D(const T &height, const T &center) :
149  Lorentzian1DParam<T>(height, center) {};
150  Lorentzian1D(const T &height, const T &center, const T &width) :
151  Lorentzian1DParam<T>(height, center, width) {};
152  // </group>
153 
154  // Copy constructor (deep copy)
155  // <group>
156  Lorentzian1D(const Lorentzian1D<T> &other) : Lorentzian1DParam<T>(other) {};
157  template <class W>
158  Lorentzian1D(const Lorentzian1D<W> &other) : Lorentzian1DParam<T>(other) {}
159  // </group>
160 
161  // Copy assignment (deep copy)
163  Lorentzian1DParam<T>::operator=(other); return *this; };
164 
165  // Destructor
166  virtual ~Lorentzian1D() {};
167 
168  //# Operators
169  // Evaluate the Lorentzian at <src>x</src>.
170  // <group>
171  virtual T eval(typename Function1D<T>::FunctionArg x) const;
172  // </group>
173 
174  //# Member functions
175  // Return a copy of this object from the heap. The caller is responsible
176  // for deleting this pointer.
177  // <group>
178  virtual Function<T> *clone() const { return new Lorentzian1D<T>(*this); };
183  // </group>
184 
185  //# Make members of parent classes known.
186 protected:
188 public:
193 };
194 
195 
196 #define Lorentzian1D_PS Lorentzian1D
197 
198 // <summary> Partial specialization of Lorentzian1D for <src>AutoDiff</src>
199 // </summary>
200 
201 // <synopsis>
202 // <note role=warning> The name <src>Lorentzian1D_PS</src> is only for cxx2html
203 // documentation problems. Use <src>Lorentzian1D</src> in your code.</note>
204 // </synopsis>
206 template <class T> class Lorentzian1D_PS<AutoDiff<T> > :
207 public Lorentzian1DParam<AutoDiff<T> >
208 {
209 public:
210  //# Constructors
211  // Constructs one dimensional Lorentzians.
212  // <group>
214  explicit Lorentzian1D_PS(const AutoDiff<T> &height) :
215  Lorentzian1DParam<AutoDiff<T> >(height) {};
216  Lorentzian1D_PS(const AutoDiff<T> &height, const AutoDiff<T> &center) :
217  Lorentzian1DParam<AutoDiff<T> >(height, center) {};
218  Lorentzian1D_PS(const AutoDiff<T> &height, const AutoDiff<T> &center,
219  const AutoDiff<T> &width) :
220  Lorentzian1DParam<AutoDiff<T> >(height, center, width) {};
221  // </group>
222 
223  // Copy constructor (deep copy)
224  // <group>
225  Lorentzian1D_PS(const Lorentzian1D_PS &other) :
226  Lorentzian1DParam<AutoDiff<T> >(other) {};
227  template <class W>
228  Lorentzian1D_PS(const Lorentzian1D_PS<W> &other) :
229  Lorentzian1DParam<AutoDiff<T> >(other) {}
230  // </group>
231 
232  // Copy assignment (deep copy)
233  Lorentzian1D_PS<AutoDiff<T> > &
234  operator=(const Lorentzian1D_PS<AutoDiff<T> > &other) {
235  Lorentzian1DParam<AutoDiff<T> >::operator=(other); return *this; };
236 
237  // Destructor
238  virtual ~Lorentzian1D_PS() {};
239 
240  //# Operators
241  // Evaluate the Lorentzian and its derivatives at <src>x</src>.
242  // <group>
243  virtual AutoDiff<T> eval(typename Function<AutoDiff<T> >::FunctionArg x) const;
244  // </group>
245 
246  //# Member functions
247  // Return a copy of this object from the heap. The caller is responsible
248  // for deleting this pointer.
249  // <group>
250  virtual Function<AutoDiff<T> > *clone() const {
251  return new Lorentzian1D<AutoDiff<T> >(*this); };
253  *cloneAD() const {
255  (*this); };
257  *cloneNonAD() const {
259  (*this); };
260  // </group>
261 
262  //# Make members of parent classes known.
263 protected:
264  using Lorentzian1DParam<AutoDiff<T> >::param_p;
265 public:
266  using Lorentzian1DParam<AutoDiff<T> >::HEIGHT;
268  using Lorentzian1DParam<AutoDiff<T> >::WIDTH;
269  using Lorentzian1DParam<AutoDiff<T> >::fwhm2int;
270 };
271 
272 #undef Lorentzian1D_PS
273 
274 
275 } //# NAMESPACE CASACORE - END
276 
277 #ifndef CASACORE_NO_AUTO_TEMPLATES
278 #include "Lorentzian1D.tcc"
279 #include "Lorentzian1D2.tcc"
280 #endif //# CASACORE_NO_AUTO_TEMPLATES
281 #endif
Lorentzian1D(const T &height)
Definition: Lorentzian1D.h:147
Parameter handling for one dimensional Lorentzian class.
Lorentzian1D(const Lorentzian1D< W > &other)
Definition: Lorentzian1D.h:158
T center() const
Get or set the center ordinate of the Lorentzian.
virtual T eval(typename Function1D< T >::FunctionArg x) const
Evaluate the Lorentzian at x.
Lorentzian1D(const Lorentzian1D< T > &other)
Copy constructor (deep copy)
Definition: Lorentzian1D.h:156
PtrHolder< T > & operator=(const PtrHolder< T > &other)
virtual ~Lorentzian1D()
Destructor.
Definition: Lorentzian1D.h:166
Lorentzian1D_PS(const AutoDiff< T > &height)
Definition: Lorentzian1D.h:213
#define Lorentzian1D_PS
Definition: Lorentzian1D.h:196
Lorentzian1D(const T &height, const T &center)
Definition: Lorentzian1D.h:148
Lorentzian1D(const T &height, const T &center, const T &width)
Definition: Lorentzian1D.h:150
A one dimensional Lorentzian class.
Definition: Lorentzian1D.h:136
virtual Function< typename FunctionTraits< T >::BaseType > * cloneNonAD() const
Definition: Lorentzian1D.h:181
T width() const
Get or set the FWHM of the Lorentzian.
Class that computes partial derivatives by automatic differentiation.
Definition: AutoDiff.h:257
casacore::Bool clone(const casacore::String &imageName, const casacore::String &newImageName)
Numerical functional interface class for 1 dimension.
Definition: Function1D.h:75
virtual Function< T > * clone() const
Return a copy of this object from the heap.
Definition: Lorentzian1D.h:178
Lorentzian1D()
Constructs the one dimensional Lorentzians.
Definition: Lorentzian1D.h:146
Lorentzian1D< T > & operator=(const Lorentzian1D< T > &other)
Copy assignment (deep copy)
Definition: Lorentzian1D.h:162
Lorentzian1DParam< T > & operator=(const Lorentzian1DParam< T > &other)
Copy assignment (deep copy)
T height() const
Get or set the peak height of the Lorentzian.
virtual Function< typename FunctionTraits< T >::DiffType > * cloneAD() const
Definition: Lorentzian1D.h:179
#define casacore
&lt;X11/Intrinsic.h&gt; #defines true, false, casacore::Bool, and String.
Definition: X11Intrinsic.h:42