casacore
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
FunctionParam.h
Go to the documentation of this file.
1 //# FunctionParam.h: Container of function parameters with masking flags
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 //# $Id$
27 
28 #ifndef SCIMATH_FUNCTIONPARAM_H
29 #define SCIMATH_FUNCTIONPARAM_H
30 
31 //# Include files
32 #include <casacore/casa/aips.h>
35 
36 //# Forward declarations
37 #include <casacore/casa/iosfwd.h>
38 
39 namespace casacore { //# NAMESPACE CASACORE - BEGIN
40 
41 // <summary>Container of function parameters with masking flags
42 // </summary>
43 //
44 // <use visibility=export>
45 //
46 // <reviewed reviewer="tcornwel" date="1996/02/22" tests="tGaussian2D"
47 // demos="">
48 // </reviewed>
49 //
50 // <synopsis>
51 // <src>FunctionParam</src> is used to provide an interface to an entity which
52 // has parameters that can be flagged.
53 // This is useful, for example, in implementing parameter
54 // fitting which operates on generic function objects.
55 //
56 // Each parameter can be masked. The mask can, e.g., be used to indicate to a
57 // generic least-squares fitting routine to only adjust parameters with
58 // a <em>True</em> mask (the default). For that reason methods that only
59 // handle <em>True</em> data items have names with <em>Adjust</em> in
60 // the names. In general the user should not be concerned with these
61 // methods, but should only manipulate the parameter <src>flags</src> and
62 // <src>values</src>.
63 //
64 // </synopsis>
65 //
66 // <example>
67 // See the <linkto class=Function>Function</linkto> class for a usage
68 // interface.
69 // </example>
70 //
71 // <motivation>
72 // Generically manipulatable adjustable parameters are important for fitting.
73 // </motivation>
74 //
75 // <templating arg=T>
76 // <li> <src>T</src> must have a default constructor, assignment operator,
77 // and copy constructor (for the Vector interface).
78 // <li> all standard mathematical should be applicable if the
79 // parameter interface is used for the calculation of
80 // <src>Functions</src>.
81 // </templating>
82 //
83 // <todo asof="2001/08/28">
84 // <li> Nothing I know of
85 // </todo>
86 
87 template<class T> class FunctionParam {
88  public:
89  //# Constructors
90  // Construct a default FunctionParam with 0 parameters
91  FunctionParam();
92  // Construct a FunctionParam with <src>n</src> parameters with zero value and
93  // all masks <em>True</em>
94  explicit FunctionParam(const uInt n);
95  // Construct a FunctionParam from the given vector, with all masks
96  // <em>True</em>
97  explicit FunctionParam(const Vector<T> &in);
98  // Copy constructor (deep copy)
99  FunctionParam(const FunctionParam<T> &other);
100  // Copy from different type (deep copy)
101  template <class W>
103  : npar_p(other.getParameters().nelements()),
105  maskedPtr_p(0) {
106  for (uInt i=0; i<npar_p; ++i) {
108  setValue(param_p[i],
110  npar_p, i);
111  }
112  mask_p = other.getParamMasks();
113  }
114 
115  // Destructor
116  virtual ~FunctionParam();
117 
118  //# Operators
119  // Copy assignment (deep copy)
121  // Manipulate the nth parameter (0-based) with no index check
122  // <group>
123  T &operator[](const uInt n) { return param_p[n]; }
124  const T &operator[](const uInt n) const { return param_p[n]; }
125  // </group>
126  // Compare two parameter sets for equal size, values and masks.
127  // <group>
128  Bool operator==(const FunctionParam<T> &other) const;
129  Bool operator!=(const FunctionParam<T> &other) const;
130  // </group>
131 
132  //# Member functions
133  // Return the number of parameters
134  uInt nelements() const { return param_p.nelements(); }
135  // Manipulate the nth parameter (0-based) with no index check
136  // <group>
137  T &parameter(const uInt n) { return param_p[n]; }
138  const T &parameter(const uInt n) const{ return param_p[n]; }
139  // </group>
140 
141  // Manipulate the mask associated with the nth parameter
142  // (e.g. to indicate whether the parameter is adjustable or nonadjustable).
143  // Note no index check.
144  // <group>
145  Bool &mask(const uInt n);
146  const Bool &mask(const uInt n) const { return mask_p[n]; }
147  // </group>
148 
149  // Get all parameters at once. Returns zero length
150  // Vector if there are no parameters.
151  const Vector<T> &getParameters() const { return param_p; }
152 
153  // Set all the parameters at once. Only the minimum of the input number and
154  // the object number of parameters will be set.
155  void setParameters(const Vector<T> &params);
156 
157  // Get all parameter masks at once. Returns zero length
158  // Vector if there are no parameters.
159  const Vector<Bool> &getParamMasks() const { return mask_p; }
160 
161  // Set all parameter masks at once. Only the minimum of the input number and
162  // the object number of parameters will be set.
163  void setParamMasks(const Vector<Bool> &masks);
164 
165  // Operations on the masked parameters only. For possible re-use the
166  // results are cached.
167  // <group>
168  // Number of masked (<src>=True</src>) parameters
169  uInt nMaskedParameters() const;
170  // All masked parameters only
171  // <group>
173  void setMaskedParameters(Vector<T> &in);
174  // </group>
175  // </group>
176 
177  // Output the parameters
178  ostream &print(ostream &os) const;
179 
180  private:
181  //# Data
182  // Number of parameters
184  // Parameters
186  // Masks
188  // Cached masked data
190 
191  //# Methods
192  // Create a cached version of the masked parameter list
193  void createMaskedPtr() const;
194  // Clear the masked parameter list
195  void clearMaskedPtr() const;
196 
197 };
198 
199 //# Global functions
200 // <summary> Global functions </summary>
201 // <group name=Output>
202 // Output declaration
203 template<class T>
204 ostream &operator<<(ostream &os, const FunctionParam<T> &par);
205 // </group>
206 
207 //# Inlines
208 template<class T>
209 inline ostream &operator<<(ostream &os, const FunctionParam<T> &par) {
210  return par.print(os); }
211 
212 
213 } //# NAMESPACE CASACORE - END
214 
215 #ifndef CASACORE_NO_AUTO_TEMPLATES
216 #include <casacore/scimath/Functionals/FunctionParam.tcc>
217 #endif //# CASACORE_NO_AUTO_TEMPLATES
218 #endif
219 
FunctionParam()
Construct a default FunctionParam with 0 parameters.
const Bool & mask(const uInt n) const
size_t nelements() const
How many elements does this array have? Product of all axis lengths.
Definition: ArrayBase.h:103
Vector< T > & getMaskedParameters() const
All masked parameters only.
void createMaskedPtr() const
Create a cached version of the masked parameter list.
FunctionParam(const FunctionParam< W > &other)
Copy from different type (deep copy)
Bool & mask(const uInt n)
Manipulate the mask associated with the nth parameter (e.g.
FunctionParam & operator=(const FunctionParam< T > &other)
Copy assignment (deep copy)
static void setValue(T &out, const T &val, const uInt, const uInt)
Set a value (and possible derivative)
const Vector< T > & getParameters() const
Get all parameters at once.
void setMaskedParameters(Vector< T > &in)
Container of function parameters with masking flags.
Definition: FunctionParam.h:87
uInt nelements() const
Return the number of parameters.
uInt nMaskedParameters() const
Operations on the masked parameters only.
Bool operator!=(const FunctionParam< T > &other) const
Vector< T > * maskedPtr_p
Cached masked data.
const T & operator[](const uInt n) const
ostream & print(ostream &os) const
Output the parameters.
void clearMaskedPtr() const
Clear the masked parameter list.
T & parameter(const uInt n)
Manipulate the nth parameter (0-based) with no index check.
Vector< Bool > mask_p
Masks.
bool Bool
Define the standard types used by Casacore.
Definition: aipstype.h:42
T & operator[](const uInt n)
Manipulate the nth parameter (0-based) with no index check.
void setParamMasks(const Vector< Bool > &masks)
Set all parameter masks at once.
Bool operator==(const FunctionParam< T > &other) const
Compare two parameter sets for equal size, values and masks.
const Vector< Bool > & getParamMasks() const
Get all parameter masks at once.
Function data types for parameters and arguments.
Vector< T > param_p
Parameters.
virtual ~FunctionParam()
Destructor.
uInt npar_p
Number of parameters.
void setParameters(const Vector< T > &params)
Set all the parameters at once.
const T & parameter(const uInt n) const
unsigned int uInt
Definition: aipstype.h:51