/usr/include/casacore/scimath/Functionals/SincFunction.h is in casacore-dev 2.2.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | //# SincFunction.h: A one dimensional sin(x)/x
//# Copyright (C) 2002,2005
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#ifndef SCIMATH_SINCFUNCTION_H
#define SCIMATH_SINCFUNCTION_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/scimath/Functionals/SincParam.h>
#include <casacore/scimath/Functionals/Function.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward declarations
// <summary> A one dimensional sin(x)/x
// </summary>
// <use visibility=export>
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="tFunctionHolder"
// demos="">
// </reviewed>
// <prerequisite>
// <li> <linkto class="SincParam">SincParam</linkto>
// <li> <linkto class="Function">Function</linkto>
// </prerequisite>
// <etymology>
// A 1-dimensional sinc function.
// </etymology>
// <synopsis>
// A <src>Sinc</src> is described by a height, a center and a width
// (halfwidth). The value is:
// <srcblock>
// let y = (x-center)/width
// height (x == center)
// height*sin(pi*y)/(pi*y) (x |= center)
// </srcblock>
// The parameters are enumerated by HEIGHT, CENTER and WIDTH. They have
// default values of (1, 0, 1).
// </synopsis>
//
// <example>
// <srcblock>
// SincFunction<Double> sf(5.0, 25.0, 7);
// sf(25); // = 5.0
// </srcblock>
// </example>
// <templating arg=T>
// <li> T should have standard numerical operators
// </templating>
// <thrown>
// <li> AipsError if incorrect parameter number specified.
// </thrown>
//
template<class T> class SincFunction : public SincParam<T>
{
public:
//# Constructors
// Constructs the SincFunction, Defaults:
// height=1, center=0, width=1.
// <note role=warning> Could not use default arguments
// that worked both with gcc and IRIX </note>
// <group>
SincFunction() : SincParam<T>() {}
explicit SincFunction(const T &height) :
SincParam<T>(height) {}
SincFunction(const T &height, const T ¢er) :
SincParam<T>(height, center) {}
SincFunction(const T &height, const T ¢er, const T &width) :
SincParam<T>(height, center, width) {}
// </group>
// Copy constructor (deep copy)
// <group>
SincFunction(const SincFunction<T> &other) : SincParam<T>(other) {}
template <class W>
SincFunction(const SincFunction<W> &other) : SincParam<T>(other) {}
// </group>
// Copy assignment (deep copy)
SincFunction<T> &operator=(const SincFunction<T> &other) {
SincParam<T>::operator=(other); return *this; }
// Destructor
virtual ~SincFunction() {}
//# Operators
// Evaluate the Sinc at <src>x</src>.
// If a vector is used as the argument only its first element is used.
// <group>
virtual T eval(typename Function<T>::FunctionArg x) const;
// </group>
//# Member functions
// Return a copy of this object from the heap. The caller is responsible
// for deleting this pointer.
// <group>
virtual Function<T> *clone() const { return new SincFunction<T>(*this); }
virtual Function<typename FunctionTraits<T>::DiffType> *cloneAD() const {
return new SincFunction<typename FunctionTraits<T>::DiffType>(*this); }
virtual Function<typename FunctionTraits<T>::BaseType> *cloneNonAD() const {
return new SincFunction<typename FunctionTraits<T>::BaseType>(*this); }
// </group>
//# Make members of parent classes known.
protected:
using SincParam<T>::param_p;
public:
using SincParam<T>::nparameters;
using SincParam<T>::CENTER;
using SincParam<T>::WIDTH;
using SincParam<T>::HEIGHT;
};
} //# NAMESPACE CASACORE - END
#ifndef CASACORE_NO_AUTO_TEMPLATES
#include <casacore/scimath/Functionals/SincFunction.tcc>
#endif //# CASACORE_NO_AUTO_TEMPLATES
#endif
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