casacore
OddPolynomialParam.h
Go to the documentation of this file.
1 //# OddPolynomialParam.h: Parameter handling for odd polynomials
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_ODDPOLYNOMIALPARAM_H
29 #define SCIMATH_ODDPOLYNOMIALPARAM_H
30 
31 //# Includes
32 #include <casacore/casa/aips.h>
33 #include <casacore/casa/Arrays/ArrayFwd.h>
34 #include <casacore/scimath/Functionals/Function1D.h>
35 #include <casacore/casa/BasicSL/String.h>
36 #include <casacore/casa/Utilities/Assert.h>
37 
38 namespace casacore { //# NAMESPACE CASACORE - BEGIN
39 
40 // <summary> Parameter handling for odd polynomials
41 // </summary>
42 
43 // <reviewed reviewer="tcornwel" date="1996/02/22" tests="tSpecialPolynomial"
44 // demos="">
45 // </reviewed>
46 
47 // <prerequisite>
48 // <li> <linkto class="FunctionParam">FunctionParam</linkto> class
49 // <li> <linkto class=Function1D>Function1D</linkto>
50 // </prerequisite>
51 
52 // <etymology>
53 // A 1-dimensional OddPolynomial's parameters.
54 // </etymology>
55 //
56 // <synopsis>
57 // An <src>OddPolynomial</src> is described by a set of coefficients;
58 // its fundamental operation is evaluating itself at some "x".
59 // The number of coefficients is the order of the polynomial divided
60 // by two, plus one.
61 //
62 // Since the <src>OddPolynomial</src> is a <src>Function</src>, the derivatives
63 // can be obtained as well.
64 //
65 // The parameter interface (see
66 // <linkto class="FunctionParam">FunctionParam</linkto> class),
67 // is used to provide an interface to the
68 // <linkto module="Fitting">Fitting</linkto> classes.
69 //
70 // This class is in general used implicitly by the <src>OddPolynomial</src>
71 // class only.
72 // </synopsis>
73 //
74 // <example>
75 // <srcblock>
76 // OddPolynomial<Float> pf(3); // Third order polynomial - coeffs 0 by default
77 // pf.setCoefficient(0, 1.0);
78 // pf[1] = 2.0; // 2x^3 + 1x^1
79 // pf(2); // == 18
80 // </srcblock>
81 // </example>
82 
83 // <templating arg=T>
84 // <li> T should have standard numerical operators. Current
85 // implementation only tested for real types (and their AutoDiffs).
86 // </templating>
87 
88 // <thrown>
89 // <li> Assertion in debug mode if attempt is made to address incorrect
90 // coefficients
91 // </thrown>
92 
93 // <todo asof="2002/02/26">
94 // <li> Nothing I know off
95 // </todo>
96 
97 template<class T> class OddPolynomialParam: public Function1D<T>
98 {
99 public:
100  //# Constructors
101  // Constructs a first order polynomial, with a coeficcient of 0.0.
103 
104  // Makes a polynomial of the given order, with all coeficcients set to
105  // zero.
107 
108  // Make this a copy of other (deep copy).
109  // <group>
111  template <class W>
113  Function1D<T>(other) {}
115  // </group>
116 
117  // Destructor
119 
120  //# Operators
121  // Comparisons.
122  // OddPolynomials are equal if they are the same order
123  // <group>
124  Bool operator==(const OddPolynomialParam<T> &other) const {
125  return (param_p == other.param_p); }
126  Bool operator!=(const OddPolynomialParam<T> &other) const {
127  return (param_p != other.param_p); }
128  // </group>
129 
130  //# Member functions
131  // Give name of function
132  virtual const String &name() const { static String x("oddpolynomial");
133  return x; }
134 
135  // What is the order of the polynomial, i.e. maximum exponent of "x".
136  uInt order() const { return 2*param_p.nelements() - 1; }
137 
138  // What is the <em>which</em>'th coefficient of the polynomial. For an nth
139  // degree polynomial, <em>which</em> varies between zero and n/2.
140  T coefficient(uInt which) const {
141  DebugAssert(which<=order(), AipsError); return param_p[which]; }
142 
143  // Return all the coefficients as a vector.
144  const Vector<T> &coefficients() const;
145 
146  // Set the <em>which</em>'th coefficient to <em>value</em>.
147  void setCoefficient(uInt which, const T value) {
148  DebugAssert(which<=order(), AipsError); param_p[which] = value; }
149 
150  // Set all the coefficients at once, throw away all existing coefficients.
152 
153  //# Make members of parent classes known.
154 protected:
156 public:
158 };
159 
160 
161 } //# NAMESPACE CASACORE - END
162 
163 #ifndef CASACORE_NO_AUTO_TEMPLATES
164 #include <casacore/scimath/Functionals/OddPolynomialParam.tcc>
165 #endif //# CASACORE_NO_AUTO_TEMPLATES
166 #endif
#define DebugAssert(expr, exception)
Definition: Assert.h:185
FunctionParam< T > param_p
The parameters and masks.
Definition: Function.h:332
OddPolynomialParam(const OddPolynomialParam< T > &other)
Make this a copy of other (deep copy).
Bool operator==(const OddPolynomialParam< T > &other) const
Comparisons.
OddPolynomialParam< T > & operator=(const OddPolynomialParam< T > &other)
void setCoefficient(uInt which, const T value)
Set the which'th coefficient to value.
void setCoefficients(const Vector< T > &coefficients)
Set all the coefficients at once, throw away all existing coefficients.
const Vector< T > & coefficients() const
Return all the coefficients as a vector.
OddPolynomialParam(uInt order)
Makes a polynomial of the given order, with all coeficcients set to zero.
uInt order() const
What is the order of the polynomial, i.e.
T coefficient(uInt which) const
What is the which'th coefficient of the polynomial.
OddPolynomialParam()
Constructs a first order polynomial, with a coeficcient of 0.0.
virtual const String & name() const
Give name of function.
Bool operator!=(const OddPolynomialParam< T > &other) const
OddPolynomialParam(const OddPolynomialParam< W > &other)
String: the storage and methods of handling collections of characters.
Definition: String.h:225
this file contains all the compiler specific defines
Definition: mainpage.dox:28
unsigned int uInt
Definition: aipstype.h:51
bool Bool
Define the standard types used by Casacore.
Definition: aipstype.h:42
LatticeExprNode value(const LatticeExprNode &expr)
This function returns the value of the expression without a mask.