source: branches/alma/src/Lorentzian1DParam.h@ 2951

Last change on this file since 2951 was 1706, checked in by WataruKawasaki, 15 years ago

New Development: No

JIRA Issue: Yes (CAS-1800)

Ready to Release: Yes

Interface Changes: No

What Interface Changed:

Test Programs:

Put in Release Notes: No

Module(s): sdfit

Description: bug fix for Lorentzian profile class


File size: 7.3 KB
Line 
1//# Lorentzian1DParam.h: Parameter handling for one-dimensional Lorentzian class
2//# Copyright (C) 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
23//# 520 Edgemont Road
24//# Charlottesville, VA 22903-2475 USA
25//#
26//# $Id: Lorentzian1DParam.h 20229 2010-02-15 12:19:06Z Wataru.Kawasaki $
27
28#ifndef SCIMATH_LORENTZIAN1DPARAM_H
29#define SCIMATH_LORENTZIAN1DPARAM_H
30
31//# Includes
32#include <casa/aips.h>
33#include <casa/BasicSL/String.h>
34#include <scimath/Functionals/Function1D.h>
35
36namespace casa { //# NAMESPACE CASA - BEGIN
37
38//# Forward declarations
39
40// <summary> Parameter handling for one dimensional Lorentzian class.</summary>
41
42// <use visibility=local>
43
44// <reviewed reviewer="tcornwel" date="1996/02/22" tests="tLorentzian1D"
45// demos="">
46// </reviewed>
47
48// <prerequisite>
49// <li> <linkto class="FunctionParam">FunctionParam</linkto> class
50// <li> <linkto class="Function1D">Function1D</linkto> class
51// </prerequisite>
52
53// <etymology>
54// A 1-dimensional Lorentzian's parameters.
55// </etymology>
56
57// <synopsis>
58// A <src>Lorentzian1D</src> is described by a height, center, and width.
59// The parameters (height, center and width) may be changed at run time.
60//
61// The width of the Lorentzian (for the constructors or the <src>setWidth
62// </src> function) is always specified in terms of the full width at half
63// maximum (FWHM). It is always positive and attempts to set a non-positive
64// width will throw an assertion when in debug mode.
65//
66// The peak height of the Lorentzian can be specified at construction time or
67// by using the <src> setHeight </src> function. Alternatively the <src>
68// setFlux </src> function can be used to implicitly set the peak height by
69// specifying the integrated area under the Lorentzian. The height (or flux)
70// can be positive, negative or zero, as this class makes no assumptions on
71// what quantity the height represents.
72//
73// <note role=tip> Changing the width of the Lorentzian will not affect
74// its peak height but will change its flux. So you should always set the
75// width before setting the flux. </note>
76//
77// The parameter interface (see
78// <linkto class="FunctionParam">FunctionParam</linkto> class),
79// is used to provide an interface to the
80// <linkto module="Fitting">Fitting</linkto> classes.
81//
82// There are 3 parameters that are used to describe the Lorentzian:
83// <ol>
84// <li> The height of the Lorentzian. This is identical to the value
85// returned using the <src>height()</src> member function.
86// <li> The center of the Lorentzian in the x direction. This is identical to
87// the value returned using the <src>center()</src> member function.
88// <li> The width (FWHM) of the Lorentzian. To aid convergence of
89// the non-linear fitting routines this parameter is allowed to be
90// negative. This does not affect the shape of the Lorentzian as the
91// square of the width is used when evaluating the function.
92// </ol>
93//
94// An enumeration for the <src>HEIGHT</src>, <src>WIDTH</src> and
95// <src>CENTER</src> parameter index is provided, enabling the setting
96// and reading of parameters with the <src>[]</src> operator. The
97// <src>mask()</src> methods can be used to check and set the parameter masks.
98//
99// This class is in general used implicitly by the <src>Lorentzian1D</src>
100// class only.
101// </synopsis>
102
103// <example>
104// <srcblock>
105// Lorentzian1D<Double> gf(5.0, 25.0, 7);
106// gf(25); // = 5.0
107// gf.setHeight(1.0);
108// gf[WIDTH](2.0);
109// gf[CENTER](0.0);
110// gf(1); // = 0.5*height = 0.5
111// </srcblock>
112// </example>
113
114// <templating arg=T>
115// <li> T should have standard numerical operators and exp() function. Current
116// implementation only tested for real types (and their AutoDiffs).
117// </templating>
118
119// <thrown>
120// <li> Assertion in debug mode if attempt is made to set a negative width
121// <li> AipsError if incorrect parameter number specified.
122// </thrown>
123
124// <todo asof="2001/08/19">
125// <li> Lorentzians that know about their DFT's could be required eventually.
126// </todo>
127
128template<class T> class Lorentzian1DParam : public Function1D<T> {
129public:
130 //# Enumerations
131 enum { HEIGHT=0, CENTER, WIDTH };
132
133 //# Constructors
134 // Constructs the one dimensional Lorentzians. Defaults:
135 // height=1, center=0, width(FWHM)=1.
136 // <note role=warning> Could not use default arguments
137 // that worked both with gcc and IRIX and all templates</note>
138 // <group>
139 Lorentzian1DParam();
140 explicit Lorentzian1DParam(const T &height);
141 Lorentzian1DParam(const T &height, const T &center);
142 Lorentzian1DParam(const T &height, const T &center, const T &width);
143 // </group>
144
145 // Copy constructor (deep copy)
146 // <group>
147 Lorentzian1DParam(const Lorentzian1DParam<T> &other);
148 template <class W>
149 Lorentzian1DParam(const Lorentzian1DParam<W> &other) :
150 Function1D<T>(other),
151 fwhm2int(T(1.0)/T(2.0)) {}
152 // </group>
153 // Copy assignment (deep copy)
154 Lorentzian1DParam<T> &operator=(const Lorentzian1DParam<T> &other);
155
156 // Destructor
157 virtual ~Lorentzian1DParam();
158
159 //# Operators
160
161 //# Member functions
162 // Give name of function
163 virtual const String &name() const { static String x("lorentzian1d");
164 return x; };
165
166 // Get or set the peak height of the Lorentzian
167 // <group>
168 T height() const { return param_p[HEIGHT]; };
169 void setHeight(const T &height) { param_p[HEIGHT] = height; };
170 // </group>
171
172 // Get or set the analytical integrated area underneath the Lorentzian.
173 // Use these functions as an alternative to the height functions.
174 // <group>
175 T flux() const;
176 void setFlux(const T &flux);
177 // </group>
178
179 // Get or set the center ordinate of the Lorentzian
180 // <group>
181 T center() const { return param_p[CENTER]; };
182 void setCenter(const T &cnter) { param_p[CENTER] = cnter; };
183 // </group>
184
185 // Get or set the FWHM of the Lorentzian.
186 // <group>
187 T width() const { return param_p[WIDTH]; };
188 void setWidth(const T &width) { param_p[WIDTH] = width; };
189 // </group>
190
191protected:
192 // Constant to scale halfwidth at 1/e to FWHM
193 /// static const T fwhm2int;
194 T fwhm2int;
195
196 //# Make members of parent classes known.
197protected:
198 using Function1D<T>::param_p;
199public:
200 using Function1D<T>::nparameters;
201};
202
203
204} //# NAMESPACE CASA - END
205
206#ifndef CASACORE_NO_AUTO_TEMPLATES
207#include "Lorentzian1DParam.tcc"
208#endif //# CASACORE_NO_AUTO_TEMPLATES
209#endif
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